diff --git a/cc/cc.go b/cc/cc.go
index e80e2a2..03ab4e4 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -38,7 +38,7 @@
 	android.PreDepsMutators(func(ctx android.RegisterMutatorsContext) {
 		ctx.BottomUp("vndk", VndkMutator).Parallel()
 		ctx.BottomUp("link", LinkageMutator).Parallel()
-		ctx.BottomUp("ndk_api", ndkApiMutator).Parallel()
+		ctx.BottomUp("ndk_api", NdkApiMutator).Parallel()
 		ctx.BottomUp("test_per_src", TestPerSrcMutator).Parallel()
 		ctx.BottomUp("version", VersionMutator).Parallel()
 		ctx.BottomUp("begin", BeginMutator).Parallel()
diff --git a/cc/ndk_library.go b/cc/ndk_library.go
index da94d33..00338b9 100644
--- a/cc/ndk_library.go
+++ b/cc/ndk_library.go
@@ -228,7 +228,7 @@
 	}
 }
 
-func ndkApiMutator(mctx android.BottomUpMutatorContext) {
+func NdkApiMutator(mctx android.BottomUpMutatorContext) {
 	if m, ok := mctx.Module().(*Module); ok {
 		if m.Enabled() {
 			if compiler, ok := m.compiler.(*stubDecorator); ok {
@@ -390,7 +390,7 @@
 
 // ndk_library creates a stub library that exposes dummy implementation
 // of functions and variables for use at build time only.
-func ndkLibraryFactory() android.Module {
+func NdkLibraryFactory() android.Module {
 	module := newStubLibrary()
 	android.InitAndroidArchModule(module, android.DeviceSupported, android.MultilibBoth)
 	module.ModuleBase.EnableNativeBridgeSupportByDefault()
diff --git a/cc/ndk_prebuilt.go b/cc/ndk_prebuilt.go
index 4356732..e849aee 100644
--- a/cc/ndk_prebuilt.go
+++ b/cc/ndk_prebuilt.go
@@ -23,8 +23,8 @@
 )
 
 func init() {
-	android.RegisterModuleType("ndk_prebuilt_object", ndkPrebuiltObjectFactory)
-	android.RegisterModuleType("ndk_prebuilt_static_stl", ndkPrebuiltStaticStlFactory)
+	android.RegisterModuleType("ndk_prebuilt_object", NdkPrebuiltObjectFactory)
+	android.RegisterModuleType("ndk_prebuilt_static_stl", NdkPrebuiltStaticStlFactory)
 	android.RegisterModuleType("ndk_prebuilt_shared_stl", NdkPrebuiltSharedStlFactory)
 }
 
@@ -68,7 +68,7 @@
 // operations. Soong's module name format is ndk_<NAME>.o.<sdk_version> where
 // the object is located under
 // ./prebuilts/ndk/current/platforms/android-<sdk_version>/arch-$(HOST_ARCH)/usr/lib/<NAME>.o.
-func ndkPrebuiltObjectFactory() android.Module {
+func NdkPrebuiltObjectFactory() android.Module {
 	module := newBaseModule(android.DeviceSupported, android.MultilibBoth)
 	module.ModuleBase.EnableNativeBridgeSupportByDefault()
 	module.linker = &ndkPrebuiltObjectLinker{
@@ -126,7 +126,7 @@
 // library (stl) library for linking operation. The soong's module name format
 // is ndk_<NAME>.a where the library is located under
 // ./prebuilts/ndk/current/sources/cxx-stl/llvm-libc++/libs/$(HOST_ARCH)/<NAME>.a.
-func ndkPrebuiltStaticStlFactory() android.Module {
+func NdkPrebuiltStaticStlFactory() android.Module {
 	module, library := NewLibrary(android.DeviceSupported)
 	library.BuildOnlyStatic()
 	module.compiler = nil
diff --git a/cc/ndk_sysroot.go b/cc/ndk_sysroot.go
index f6de4ef..56fd54b 100644
--- a/cc/ndk_sysroot.go
+++ b/cc/ndk_sysroot.go
@@ -58,7 +58,7 @@
 
 func init() {
 	android.RegisterModuleType("ndk_headers", ndkHeadersFactory)
-	android.RegisterModuleType("ndk_library", ndkLibraryFactory)
+	android.RegisterModuleType("ndk_library", NdkLibraryFactory)
 	android.RegisterModuleType("versioned_ndk_headers", versionedNdkHeadersFactory)
 	android.RegisterModuleType("preprocessed_ndk_headers", preprocessedNdkHeadersFactory)
 	android.RegisterSingletonType("ndk", NdkSingleton)
diff --git a/cc/testing.go b/cc/testing.go
index 18cc83f..417ea4a 100644
--- a/cc/testing.go
+++ b/cc/testing.go
@@ -265,6 +265,7 @@
 	ctx.RegisterModuleType("toolchain_library", ToolchainLibraryFactory)
 	ctx.RegisterModuleType("llndk_library", LlndkLibraryFactory)
 	ctx.RegisterModuleType("llndk_headers", llndkHeadersFactory)
+	ctx.RegisterModuleType("ndk_library", NdkLibraryFactory)
 	ctx.RegisterModuleType("vendor_public_library", vendorPublicLibraryFactory)
 	ctx.RegisterModuleType("cc_object", ObjectFactory)
 	ctx.RegisterModuleType("filegroup", android.FileGroupFactory)