diff --git a/android/module_context.go b/android/module_context.go
index 1cab630..d3e2770 100644
--- a/android/module_context.go
+++ b/android/module_context.go
@@ -234,6 +234,8 @@
 	variables   map[string]string
 }
 
+var _ ModuleContext = &moduleContext{}
+
 func (m *moduleContext) ninjaError(params BuildParams, err error) (PackageContext, BuildParams) {
 	return pctx, BuildParams{
 		Rule:            ErrorRule,