diff --git a/android/androidmk.go b/android/androidmk.go
index aeb0aa5..793947e 100644
--- a/android/androidmk.go
+++ b/android/androidmk.go
@@ -43,7 +43,7 @@
 	OutputFile OptionalPath
 	Disabled   bool
 
-	Custom func(w io.Writer, name, prefix string) error
+	Custom func(w io.Writer, name, prefix, moduleDir string) error
 
 	Extra []func(w io.Writer, outputFile Path) error
 }
@@ -185,7 +185,7 @@
 			prefix = "2ND_" + prefix
 		}
 
-		return data.Custom(w, name, prefix)
+		return data.Custom(w, name, prefix, filepath.Dir(ctx.BlueprintFile(mod)))
 	}
 
 	if data.Disabled {