diff --git a/apex/androidmk.go b/apex/androidmk.go
index 6b168fee4..08d190c66 100644
--- a/apex/androidmk.go
+++ b/apex/androidmk.go
@@ -78,6 +78,8 @@ func (a *apexBundle) androidMkForFiles(w io.Writer, apexBundleName, apexName, mo
 		}
 	}
 
+	seenDataOutPaths := make(map[string]bool)
+
 	for _, fi := range a.filesInfo {
 		if cc, ok := fi.module.(*cc.Module); ok && cc.Properties.HideFromMake {
 			continue
@@ -112,16 +114,24 @@ func (a *apexBundle) androidMkForFiles(w io.Writer, apexBundleName, apexName, mo
 		pathWhenActivated := filepath.Join("$(PRODUCT_OUT)", "apex", apexName, fi.installDir)
 		if apexType == flattenedApex {
 			// /system/apex/<name>/{lib|framework|...}
-			fmt.Fprintln(w, "LOCAL_MODULE_PATH :=", filepath.Join(a.installDir.ToMakePath().String(),
-				apexBundleName, fi.installDir))
+			modulePath := filepath.Join(a.installDir.ToMakePath().String(), apexBundleName, fi.installDir)
+			fmt.Fprintln(w, "LOCAL_MODULE_PATH :=", modulePath)
 			if a.primaryApexType && !symbolFilesNotNeeded {
 				fmt.Fprintln(w, "LOCAL_SOONG_SYMBOL_PATH :=", pathWhenActivated)
 			}
 			if len(fi.symlinks) > 0 {
 				fmt.Fprintln(w, "LOCAL_MODULE_SYMLINKS :=", strings.Join(fi.symlinks, " "))
 			}
-			if len(fi.dataPaths) > 0 {
-				fmt.Fprintln(w, "LOCAL_TEST_DATA :=", strings.Join(cc.AndroidMkDataPaths(fi.dataPaths), " "))
+			newDataPaths := []android.Path{}
+			for _, path := range fi.dataPaths {
+				dataOutPath := modulePath + ":" + path.Rel()
+				if ok := seenDataOutPaths[dataOutPath]; !ok {
+					newDataPaths = append(newDataPaths, path)
+					seenDataOutPaths[dataOutPath] = true
+				}
+			}
+			if len(newDataPaths) > 0 {
+				fmt.Fprintln(w, "LOCAL_TEST_DATA :=", strings.Join(cc.AndroidMkDataPaths(newDataPaths), " "))
 			}
 
 			if fi.module != nil && len(fi.module.NoticeFiles()) > 0 {
diff --git a/apex/apex_test.go b/apex/apex_test.go
index 9633f2713..ced113f2f 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -184,6 +184,7 @@ func testApexContext(t *testing.T, bp string, handlers ...testCustomizer) (*andr
 		"dummy.txt":                                  nil,
 		"baz":                                        nil,
 		"bar/baz":                                    nil,
+		"testdata/baz":                               nil,
 	}
 
 	cc.GatherRequiredFilesForTest(fs)
@@ -274,6 +275,15 @@ func ensureContains(t *testing.T, result string, expected string) {
 	}
 }
 
+// ensure that 'result' contains 'expected' exactly one time
+func ensureContainsOnce(t *testing.T, result string, expected string) {
+	t.Helper()
+	count := strings.Count(result, expected)
+	if count != 1 {
+		t.Errorf("%q is found %d times (expected 1 time) in %q", expected, count, result)
+	}
+}
+
 // ensures that 'result' does not contain 'notExpected'
 func ensureNotContains(t *testing.T, result string, notExpected string) {
 	t.Helper()
@@ -3423,6 +3433,13 @@ func TestApexWithTests(t *testing.T) {
 			stl: "none",
 		}
 
+		filegroup {
+			name: "fg2",
+			srcs: [
+				"testdata/baz"
+			],
+		}
+
 		cc_test {
 			name: "mytests",
 			gtest: false,
@@ -3436,6 +3453,10 @@ func TestApexWithTests(t *testing.T) {
 			system_shared_libs: [],
 			static_executable: true,
 			stl: "none",
+			data: [
+				":fg",
+				":fg2",
+			],
 		}
 	`)
 
@@ -3475,7 +3496,8 @@ func TestApexWithTests(t *testing.T) {
 	data = android.AndroidMkDataForTest(t, config, "", flatBundle)
 	data.Custom(&builder, name, prefix, "", data)
 	flatAndroidMk := builder.String()
-	ensureContains(t, flatAndroidMk, "LOCAL_TEST_DATA := :baz :bar/baz\n")
+	ensureContainsOnce(t, flatAndroidMk, "LOCAL_TEST_DATA := :baz :bar/baz\n")
+	ensureContainsOnce(t, flatAndroidMk, "LOCAL_TEST_DATA := :testdata/baz\n")
 }
 
 func TestInstallExtraFlattenedApexes(t *testing.T) {