diff --git a/helper/schema/schema.go b/helper/schema/schema.go
index 6773fe584..43d0f0070 100644
--- a/helper/schema/schema.go
+++ b/helper/schema/schema.go
@@ -395,7 +395,7 @@ func (m *schemaMap) DeepCopy() schemaMap {
 	if err != nil {
 		panic(err)
 	}
-	return copy.(schemaMap)
+	return *copy.(*schemaMap)
 }
 
 // Diff returns the diff for a resource given the schema map,