diff --git a/java/dexpreopt_config.go b/java/dexpreopt_config.go
index 9100e87..28f50d7 100644
--- a/java/dexpreopt_config.go
+++ b/java/dexpreopt_config.go
@@ -250,8 +250,6 @@
 
 var defaultBootclasspathKey = android.NewOnceKey("defaultBootclasspath")
 
-var copyOf = android.CopyOf
-
 func init() {
 	android.RegisterMakeVarsProvider(pctx, dexpreoptConfigMakevars)
 }
diff --git a/java/robolectric.go b/java/robolectric.go
index 6bbe872..0041af4 100644
--- a/java/robolectric.go
+++ b/java/robolectric.go
@@ -299,7 +299,7 @@
 func (r *robolectricTest) generateRoboSrcJar(ctx android.ModuleContext, outputFile android.WritablePath,
 	instrumentedApp *AndroidApp) {
 
-	srcJarArgs := copyOf(instrumentedApp.srcJarArgs)
+	srcJarArgs := android.CopyOf(instrumentedApp.srcJarArgs)
 	srcJarDeps := append(android.Paths(nil), instrumentedApp.srcJarDeps...)
 
 	for _, m := range ctx.GetDirectDepsWithTag(roboCoverageLibsTag) {