diff --git a/filesystem/filesystem.go b/filesystem/filesystem.go
index 4bdd0a4..9756b82 100644
--- a/filesystem/filesystem.go
+++ b/filesystem/filesystem.go
@@ -264,7 +264,7 @@
 func (f *filesystem) filterInstallablePackagingSpec(ps android.PackagingSpec) bool {
 	// Filesystem module respects the installation semantic. A PackagingSpec from a module with
 	// IsSkipInstall() is skipped.
-	return !ps.SkipInstall()
+	return !ps.SkipInstall() && (ps.Partition() == f.PartitionType())
 }
 
 var pctx = android.NewPackageContext("android/soong/filesystem")
diff --git a/filesystem/filesystem_test.go b/filesystem/filesystem_test.go
index 057dcaa..1e50836 100644
--- a/filesystem/filesystem_test.go
+++ b/filesystem/filesystem_test.go
@@ -584,3 +584,28 @@
 	android.AssertStringDoesContain(t, "erofs fs type compress hint", buildImageConfig, "erofs_default_compress_hints=compress_hints.txt")
 	android.AssertStringDoesContain(t, "erofs fs type sparse", buildImageConfig, "erofs_sparse_flag=-s")
 }
+
+// If a system_ext/ module depends on system/ module, the dependency should *not*
+// be installed in system_ext/
+func TestDoNotPackageCrossPartitionDependencies(t *testing.T) {
+	result := fixture.RunTestWithBp(t, `
+		android_filesystem {
+			name: "myfilesystem",
+			deps: ["binfoo"],
+			partition_type: "system_ext",
+		}
+
+		cc_binary {
+			name: "binfoo",
+			shared_libs: ["libfoo"],
+			system_ext_specific: true,
+		}
+		cc_library_shared {
+			name: "libfoo", // installed in system/
+		}
+	`)
+
+	partition := result.ModuleForTests("myfilesystem", "android_common")
+	fileList := android.ContentFromFileRuleForTests(t, result.TestContext, partition.Output("fileList"))
+	android.AssertDeepEquals(t, "filesystem with dependencies on different partition", "bin/binfoo\n", fileList)
+}
diff --git a/filesystem/system_image.go b/filesystem/system_image.go
index 57239ae..7dbf986 100644
--- a/filesystem/system_image.go
+++ b/filesystem/system_image.go
@@ -103,6 +103,6 @@
 // partition.  Note that "apex" module installs its contents to "apex"(fake partition) as well
 // for symbol lookup by imitating "activated" paths.
 func (s *systemImage) filterPackagingSpec(ps android.PackagingSpec) bool {
-	return s.filesystem.filterInstallablePackagingSpec(ps) &&
+	return !ps.SkipInstall() &&
 		(ps.Partition() == "system" || ps.Partition() == "root")
 }