diff --git a/org.eclipse.sisu.inject/pom.xml b/org.eclipse.sisu.inject/pom.xml
index f91ef0ad..e0f96fc2 100644
--- a/org.eclipse.sisu.inject/pom.xml
+++ b/org.eclipse.sisu.inject/pom.xml
@@ -317,7 +317,7 @@
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
           <redirectTestOutputToFile>true</redirectTestOutputToFile>
-          <argLine>-Xmx64m @{jacoco.argLine}</argLine>
+          <argLine>-Xmx64m --add-opens java.base/java.lang=ALL-UNNAMED @{jacoco.argLine}</argLine>
           <classpathDependencyExcludes>
             <classpathDependencyExclude>com.google.guava:guava</classpathDependencyExclude>
             <classpathDependencyExclude>com.google.inject:guice</classpathDependencyExclude>