diff --git a/src/it/add-third-party-skip-second-execution/invoker.properties b/src/it/add-third-party-skip-second-execution/invoker.properties
new file mode 100644
index 000000000..20dd58c7a
--- /dev/null
+++ b/src/it/add-third-party-skip-second-execution/invoker.properties
@@ -0,0 +1,23 @@
+###
+# #%L
+# License Maven Plugin
+# %%
+# Copyright (C) 2023 MojoHaus and Contributors
+# %%
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Lesser Public License for more details.
+#
+# You should have received a copy of the GNU General Lesser Public
+# License along with this program.  If not, see
+# <http://www.gnu.org/licenses/lgpl-3.0.html>.
+# #L%
+###
+invoker.goals.1=clean license:add-third-party
+invoker.goals.2=license:add-third-party
diff --git a/src/it/add-third-party-skip-second-execution/pom.xml b/src/it/add-third-party-skip-second-execution/pom.xml
new file mode 100644
index 000000000..c92b5ddb7
--- /dev/null
+++ b/src/it/add-third-party-skip-second-execution/pom.xml
@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  #%L
+  License Maven Plugin
+  %%
+  Copyright (C) 2023 MojoHaus and Contributors
+  %%
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation, either version 3 of the
+  License, or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Lesser Public License for more details.
+
+  You should have received a copy of the GNU General Lesser Public
+  License along with this program.  If not, see
+  <http://www.gnu.org/licenses/lgpl-3.0.html>.
+  #L%
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/maven-v4_0_0.xsd">
+
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.codehaus.mojo.license.test</groupId>
+  <artifactId>add-third-party-skip-second-execution</artifactId>
+  <version>1.0.0</version>
+
+  <name>License Test :: add-third-party-skip-second-execution</name>
+  <url>https://github.com/mojohaus/license-maven-plugin/issues/498</url>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <license.generateBundle>true</license.generateBundle>
+    <license.verbose>true</license.verbose>
+  </properties>
+
+  <build>
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.codehaus.mojo</groupId>
+          <artifactId>license-maven-plugin</artifactId>
+          <version>@project.version@</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+
+</project>
diff --git a/src/it/add-third-party-skip-second-execution/postbuild.groovy b/src/it/add-third-party-skip-second-execution/postbuild.groovy
new file mode 100644
index 000000000..395f02827
--- /dev/null
+++ b/src/it/add-third-party-skip-second-execution/postbuild.groovy
@@ -0,0 +1,29 @@
+/*
+ * #%L
+ * License Maven Plugin
+ * %%
+ * Copyright (C) 2023 MojoHaus and Contributors
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Lesser Public License for more details.
+ *
+ * You should have received a copy of the GNU General Lesser Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/lgpl-3.0.html>.
+ * #L%
+ */
+
+file = new File(basedir, 'build.log');
+assert file.exists();
+content = file.text;
+assert 1 == content.count('[INFO] Writing third-party file to');
+assert 1 == content.count('[INFO] Writing bundled third-party file to');
+assert 1 == content.count('[INFO] All files are up to date, skip goal execution.');
+assert 2 == content.count('[INFO] BUILD SUCCESS');
diff --git a/src/it/aggregate-add-third-party-second-execution/child1/pom.xml b/src/it/aggregate-add-third-party-second-execution/child1/pom.xml
new file mode 100644
index 000000000..e3693a3ff
--- /dev/null
+++ b/src/it/aggregate-add-third-party-second-execution/child1/pom.xml
@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  #%L
+  License Maven Plugin
+  %%
+  Copyright (C) 2023 MojoHaus and Contributors
+  %%
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation, either version 3 of the
+  License, or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Lesser Public License for more details.
+
+  You should have received a copy of the GNU General Lesser Public
+  License along with this program.  If not, see
+  <http://www.gnu.org/licenses/lgpl-3.0.html>.
+  #L%
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/maven-v4_0_0.xsd">
+
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.codehaus.mojo.license.test</groupId>
+    <artifactId>aggregate-add-third-party-second-execution</artifactId>
+    <version>1.0.0</version>
+  </parent>
+
+  <artifactId>child1</artifactId>
+
+</project>
+
+
diff --git a/src/it/aggregate-add-third-party-second-execution/invoker.properties b/src/it/aggregate-add-third-party-second-execution/invoker.properties
new file mode 100644
index 000000000..9d7487510
--- /dev/null
+++ b/src/it/aggregate-add-third-party-second-execution/invoker.properties
@@ -0,0 +1,23 @@
+###
+# #%L
+# License Maven Plugin
+# %%
+# Copyright (C) 2023 MojoHaus and Contributors
+# %%
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Lesser Public License for more details.
+#
+# You should have received a copy of the GNU General Lesser Public
+# License along with this program.  If not, see
+# <http://www.gnu.org/licenses/lgpl-3.0.html>.
+# #L%
+###
+invoker.goals.1=clean license:aggregate-add-third-party
+invoker.goals.2=license:aggregate-add-third-party
diff --git a/src/it/aggregate-add-third-party-second-execution/pom.xml b/src/it/aggregate-add-third-party-second-execution/pom.xml
new file mode 100644
index 000000000..34039eae7
--- /dev/null
+++ b/src/it/aggregate-add-third-party-second-execution/pom.xml
@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  #%L
+  License Maven Plugin
+  %%
+  Copyright (C) 2023 MojoHaus and Contributors
+  %%
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation, either version 3 of the
+  License, or (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Lesser Public License for more details.
+
+  You should have received a copy of the GNU General Lesser Public
+  License along with this program.  If not, see
+  <http://www.gnu.org/licenses/lgpl-3.0.html>.
+  #L%
+  -->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+
+  <modelVersion>4.0.0</modelVersion>
+
+  <groupId>org.codehaus.mojo.license.test</groupId>
+  <artifactId>aggregate-add-third-party-second-execution</artifactId>
+  <version>1.0.0</version>
+
+  <modules>
+    <module>child1</module>
+  </modules>
+
+  <name>License Test :: aggregate-add-third-party-second-execution</name>
+  <url>https://github.com/mojohaus/license-maven-plugin/issues/498</url>
+
+  <packaging>pom</packaging>
+
+  <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <license.generateBundle>true</license.generateBundle>
+    <license.verbose>true</license.verbose>
+  </properties>
+
+  <build>
+
+    <pluginManagement>
+      <plugins>
+        <plugin>
+          <groupId>org.codehaus.mojo</groupId>
+          <artifactId>license-maven-plugin</artifactId>
+          <version>@project.version@</version>
+        </plugin>
+      </plugins>
+    </pluginManagement>
+  </build>
+
+</project>
+
+
diff --git a/src/it/aggregate-add-third-party-second-execution/postbuild.groovy b/src/it/aggregate-add-third-party-second-execution/postbuild.groovy
new file mode 100644
index 000000000..2245daad4
--- /dev/null
+++ b/src/it/aggregate-add-third-party-second-execution/postbuild.groovy
@@ -0,0 +1,29 @@
+/*
+ * #%L
+ * License Maven Plugin
+ * %%
+ * Copyright (C) 2023 MojoHaus and Contributors
+ * %%
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Lesser Public License for more details.
+ *
+ * You should have received a copy of the GNU General Lesser Public
+ * License along with this program.  If not, see
+ * <http://www.gnu.org/licenses/lgpl-3.0.html>.
+ * #L%
+ */
+
+file = new File(basedir, 'build.log');
+assert file.exists();
+content = file.text;
+assert 1 == content.count('[INFO] Writing third-party file to');
+assert 1 == content.count('[INFO] Writing bundled third-party file');
+assert 1 == content.count('[INFO] All files are up to date, skip goal execution.');
+assert 2 == content.count('[INFO] BUILD SUCCESS');
diff --git a/src/main/java/org/codehaus/mojo/license/AbstractAddThirdPartyMojo.java b/src/main/java/org/codehaus/mojo/license/AbstractAddThirdPartyMojo.java
index f1fb67e07..4fbadf2c6 100644
--- a/src/main/java/org/codehaus/mojo/license/AbstractAddThirdPartyMojo.java
+++ b/src/main/java/org/codehaus/mojo/license/AbstractAddThirdPartyMojo.java
@@ -716,20 +716,20 @@ protected void init()
 
         thirdPartyFile = new File( outputDirectory, thirdPartyFilename );
 
-        long buildTimestamp = getBuildTimestamp();
+        File projectFile = project.getFile() != null ? project.getFile() : new File("");
 
-        LOG.debug( "Build start   at: {}", buildTimestamp );
-        LOG.debug( "third-party file: {}", thirdPartyFile.lastModified() );
+        LOG.debug( "project file: {} last modified: {}", projectFile, projectFile.lastModified() );
+        LOG.debug( "third-party file: {} last modified: {}", thirdPartyFile, thirdPartyFile.lastModified() );
 
-        doGenerate = force || !thirdPartyFile.exists() || buildTimestamp > thirdPartyFile.lastModified();
+        doGenerate = force || !thirdPartyFile.exists() || projectFile.lastModified() > thirdPartyFile.lastModified();
 
         if ( generateBundle )
         {
 
             File bundleFile = FileUtil.getFile( outputDirectory, bundleThirdPartyPath );
 
-            LOG.debug( "bundle third-party file: {}", bundleFile.lastModified() );
-            doGenerateBundle = force || !bundleFile.exists() || buildTimestamp > bundleFile.lastModified();
+            LOG.debug( "bundle third-party file: {} last modified: {}", bundleFile, bundleFile.lastModified() );
+            doGenerateBundle = force || !bundleFile.exists() || projectFile.lastModified() > bundleFile.lastModified();
         }
         else
         {
@@ -738,6 +738,10 @@ protected void init()
             doGenerateBundle = false;
         }
 
+        if ( shouldSkip() ) {
+            return;
+        }
+
         projectDependencies = loadDependencies();
 
         licenseMap = getHelper().createLicenseMap( projectDependencies );
diff --git a/src/main/java/org/codehaus/mojo/license/AbstractLicenseMojo.java b/src/main/java/org/codehaus/mojo/license/AbstractLicenseMojo.java
index 3b12e49c3..a837d618e 100644
--- a/src/main/java/org/codehaus/mojo/license/AbstractLicenseMojo.java
+++ b/src/main/java/org/codehaus/mojo/license/AbstractLicenseMojo.java
@@ -186,14 +186,9 @@ public final void execute()
             }
 
             // check if mojo can be skipped
-
-            canContinue = checkSkip();
-            if ( !canContinue )
+            if ( shouldSkip() )
             {
-                if ( isVerbose() )
-                {
-                    LOG.info( "Goal will not be executed." );
-                }
+                LOG.info( "All files are up to date, skip goal execution." );
                 return;
             }
 
@@ -279,14 +274,6 @@ public final MavenSession getSession()
         return session;
     }
 
-    /**
-     * @return the build timestamp (used to have a unique timestamp all over a build).
-     */
-    public final long getBuildTimestamp()
-    {
-        return session.getStartTime().getTime();
-    }
-
     // ----------------------------------------------------------------------
     // Protected Methods
     // ----------------------------------------------------------------------
@@ -327,12 +314,12 @@ protected boolean checkPackaging()
     /**
      * Checks if the mojo execution should be skipped.
      *
-     * @return {@code false} if the mojo should not be executed.
+     * @return {@code true} if the mojo should not be executed.
      */
-    protected boolean checkSkip()
+    protected boolean shouldSkip()
     {
         // by default, never skip goal
-        return true;
+        return false;
     }
 
     /**
diff --git a/src/main/java/org/codehaus/mojo/license/AddThirdPartyMojo.java b/src/main/java/org/codehaus/mojo/license/AddThirdPartyMojo.java
index 40272c07d..bb177f716 100644
--- a/src/main/java/org/codehaus/mojo/license/AddThirdPartyMojo.java
+++ b/src/main/java/org/codehaus/mojo/license/AddThirdPartyMojo.java
@@ -155,15 +155,9 @@ protected boolean checkPackaging()
      * {@inheritDoc}
      */
     @Override
-    protected boolean checkSkip()
+    protected boolean shouldSkip()
     {
-        if ( !doGenerate && !doGenerateBundle && !doGenerateMissing )
-        {
-
-            LOG.info( "All files are up to date, skip goal execution." );
-            return false;
-        }
-        return true;
+        return !doGenerate && !doGenerateBundle && !doGenerateMissing;
     }
 
     /**
diff --git a/src/main/java/org/codehaus/mojo/license/AggregatorAddThirdPartyMojo.java b/src/main/java/org/codehaus/mojo/license/AggregatorAddThirdPartyMojo.java
index 2c5745e0c..7579ad065 100644
--- a/src/main/java/org/codehaus/mojo/license/AggregatorAddThirdPartyMojo.java
+++ b/src/main/java/org/codehaus/mojo/license/AggregatorAddThirdPartyMojo.java
@@ -130,15 +130,9 @@ protected boolean checkPackaging()
      * {@inheritDoc}
      */
     @Override
-    protected boolean checkSkip()
+    protected boolean shouldSkip()
     {
-        if ( !doGenerate && !doGenerateBundle )
-        {
-
-            LOG.info( "All files are up to date, skip goal execution." );
-            return false;
-        }
-        return super.checkSkip();
+        return !doGenerate && !doGenerateBundle;
     }
 
     @Override