diff --git a/android/Android.bp b/android/Android.bp
index cbd3459..f58a472 100644
--- a/android/Android.bp
+++ b/android/Android.bp
@@ -88,6 +88,7 @@
         "test_asserts.go",
         "test_suites.go",
         "testing.go",
+        "updatable_modules.go",
         "util.go",
         "variable.go",
         "visibility.go",
diff --git a/apex/constants.go b/android/updatable_modules.go
similarity index 82%
rename from apex/constants.go
rename to android/updatable_modules.go
index c68edb7..71c76c5 100644
--- a/apex/constants.go
+++ b/android/updatable_modules.go
@@ -12,11 +12,11 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-package apex
+package android
 
-// This file contains branch specific constants. They are stored in a separate
-// file to minimise the potential of merge conflicts between branches when
-// the code from the package is changed.
+// This file contains branch specific constants for building updatable modules.
+// They are stored in a separate file to minimise the potential of merge
+// conflicts between branches when the code from the package is changed.
 
 // The default manifest version for all the modules on this branch.
 // This version code will be used only if there is no version field in the
@@ -33,4 +33,4 @@
 // * AOSP            - xx9990000
 // * x-mainline-prod - xx9990000
 // * master          - 990090000
-const defaultManifestVersion = "339990000"
+const DefaultUpdatableModuleVersion = "339990000"
diff --git a/apex/Android.bp b/apex/Android.bp
index 6533c61..480ad06 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -26,7 +26,6 @@
         "apex_sdk_member.go",
         "apex_singleton.go",
         "builder.go",
-        "constants.go",
         "deapexer.go",
         "key.go",
         "prebuilt.go",
diff --git a/apex/builder.go b/apex/builder.go
index 58acf71..f1b1448 100644
--- a/apex/builder.go
+++ b/apex/builder.go
@@ -214,7 +214,7 @@
 		Args: map[string]string{
 			"provideNativeLibs": strings.Join(provideNativeLibs, " "),
 			"requireNativeLibs": strings.Join(requireNativeLibs, " "),
-			"default_version":   defaultManifestVersion,
+			"default_version":   android.DefaultUpdatableModuleVersion,
 			"opt":               strings.Join(optCommands, " "),
 		},
 	})