diff --git a/apex/apex.go b/apex/apex.go
index 3584896..d25c256 100644
--- a/apex/apex.go
+++ b/apex/apex.go
@@ -1046,7 +1046,7 @@
 		Custom: func(w io.Writer, name, prefix, moduleDir string, data android.AndroidMkData) {
 			moduleNames := []string{}
 			if a.installable() {
-				a.androidMkForFiles(w, name, moduleDir)
+				moduleNames = a.androidMkForFiles(w, name, moduleDir)
 			}
 
 			if a.flattened && apexType.image() {