diff --git a/apex/apex.go b/apex/apex.go
index 0445c20..fdfcf86 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -136,7 +136,7 @@
 	pctx.HostBinToolVariable("zip2zip", "zip2zip")
 	pctx.HostBinToolVariable("zipalign", "zipalign")
 
-	android.RegisterModuleType("apex", apexBundleFactory)
+	android.RegisterModuleType("apex", ApexBundleFactory)
 
 	android.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.TopDown("apex_deps", apexDepsMutator)
@@ -871,7 +871,7 @@
 	}
 }
 
-func apexBundleFactory() android.Module {
+func ApexBundleFactory() android.Module {
 	module := &apexBundle{
 		outputFiles: map[apexPackaging]android.WritablePath{},
 	}
diff --git a/apex/apex_test.go b/apex/apex_test.go
index d1794ee..b178829 100644
--- a/apex/apex_test.go
+++ b/apex/apex_test.go
@@ -28,7 +28,7 @@
 	defer teardown(buildDir)
 
 	ctx := android.NewTestArchContext()
-	ctx.RegisterModuleType("apex", android.ModuleFactoryAdaptor(apexBundleFactory))
+	ctx.RegisterModuleType("apex", android.ModuleFactoryAdaptor(ApexBundleFactory))
 	ctx.RegisterModuleType("apex_key", android.ModuleFactoryAdaptor(apexKeyFactory))
 
 	ctx.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {