diff --git a/src/module_writer.rs b/src/module_writer.rs
index 309d0890b..8e372a4bb 100644
--- a/src/module_writer.rs
+++ b/src/module_writer.rs
@@ -1286,8 +1286,17 @@ pub fn write_python_part(
     }
 
     for package in python_packages {
-        for absolute in WalkBuilder::new(package).hidden(false).build() {
+        for absolute in WalkBuilder::new(&project_layout.project_root)
+            .hidden(false)
+            .parents(false)
+            .git_global(false)
+            .git_exclude(false)
+            .build()
+        {
             let absolute = absolute?.into_path();
+            if !absolute.starts_with(package.as_path()) {
+                continue;
+            }
             let relative = absolute.strip_prefix(python_dir).unwrap();
             if absolute.is_dir() {
                 writer.add_directory(relative)?;
diff --git a/src/project_layout.rs b/src/project_layout.rs
index 1714530ba..fe53fd5f8 100644
--- a/src/project_layout.rs
+++ b/src/project_layout.rs
@@ -14,6 +14,8 @@ const PYPROJECT_TOML: &str = "pyproject.toml";
 /// Whether this project is pure rust or rust mixed with python and whether it has wheel data
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct ProjectLayout {
+    /// Contains the absolute path to the project root directory
+    pub project_root: PathBuf,
     /// Contains the absolute path to the python source directory
     pub python_dir: PathBuf,
     /// Contains the canonicalized (i.e. absolute) path to the python part of the project
@@ -397,6 +399,7 @@ impl ProjectLayout {
             eprintln!("🍹 Building a mixed python/rust project");
 
             Ok(ProjectLayout {
+                project_root: project_root.to_path_buf(),
                 python_dir: python_root,
                 python_packages,
                 python_module: Some(python_module),
@@ -415,6 +418,7 @@ impl ProjectLayout {
             }
 
             Ok(ProjectLayout {
+                project_root: project_root.to_path_buf(),
                 python_dir: python_root,
                 python_packages,
                 python_module: None,
diff --git a/test-crates/pyo3-mixed-implicit/.gitignore b/test-crates/pyo3-mixed-implicit/.gitignore
new file mode 100644
index 000000000..18880a5ac
--- /dev/null
+++ b/test-crates/pyo3-mixed-implicit/.gitignore
@@ -0,0 +1 @@
+*.py[cdo]
diff --git a/test-crates/pyo3-mixed-include-exclude/.gitignore b/test-crates/pyo3-mixed-include-exclude/.gitignore
new file mode 100644
index 000000000..18880a5ac
--- /dev/null
+++ b/test-crates/pyo3-mixed-include-exclude/.gitignore
@@ -0,0 +1 @@
+*.py[cdo]
diff --git a/test-crates/pyo3-mixed-py-subdir/.gitignore b/test-crates/pyo3-mixed-py-subdir/.gitignore
new file mode 100644
index 000000000..18880a5ac
--- /dev/null
+++ b/test-crates/pyo3-mixed-py-subdir/.gitignore
@@ -0,0 +1 @@
+*.py[cdo]
diff --git a/test-crates/pyo3-mixed-src/.gitignore b/test-crates/pyo3-mixed-src/.gitignore
new file mode 100644
index 000000000..18880a5ac
--- /dev/null
+++ b/test-crates/pyo3-mixed-src/.gitignore
@@ -0,0 +1 @@
+*.py[cdo]
diff --git a/test-crates/pyo3-mixed/.gitignore b/test-crates/pyo3-mixed/.gitignore
new file mode 100644
index 000000000..18880a5ac
--- /dev/null
+++ b/test-crates/pyo3-mixed/.gitignore
@@ -0,0 +1 @@
+*.py[cdo]
diff --git a/tests/run.rs b/tests/run.rs
index d5383563c..7455faabb 100644
--- a/tests/run.rs
+++ b/tests/run.rs
@@ -730,6 +730,7 @@ fn pyo3_mixed_include_exclude_sdist() {
         SdistGenerator::Cargo,
         expect![[r#"
             {
+                "pyo3_mixed_include_exclude-2.1.3/.gitignore",
                 "pyo3_mixed_include_exclude-2.1.3/Cargo.lock",
                 "pyo3_mixed_include_exclude-2.1.3/Cargo.toml",
                 "pyo3_mixed_include_exclude-2.1.3/PKG-INFO",
@@ -759,6 +760,7 @@ fn pyo3_mixed_include_exclude_git_sdist_generator() {
         SdistGenerator::Git,
         expect![[r#"
             {
+                "pyo3_mixed_include_exclude-2.1.3/.gitignore",
                 "pyo3_mixed_include_exclude-2.1.3/Cargo.lock",
                 "pyo3_mixed_include_exclude-2.1.3/Cargo.toml",
                 "pyo3_mixed_include_exclude-2.1.3/PKG-INFO",