diff --git a/internal/php5/php5.go b/internal/php5/php5.go
index 7f98c48..9995ca6 100644
Binary files a/internal/php5/php5.go and b/internal/php5/php5.go differ
diff --git a/internal/php7/php7.go b/internal/php7/php7.go
index e224ae3..e67e095 100644
Binary files a/internal/php7/php7.go and b/internal/php7/php7.go differ
diff --git a/internal/php7/php7.y b/internal/php7/php7.y
index 6dd4946..afa2f69 100644
--- a/internal/php7/php7.y
+++ b/internal/php7/php7.y
@@ -1993,7 +1993,7 @@ type:
 return_type:
         /* empty */
             {
-                $$ = nil
+                $$ = &ast.ReturnType{}
             }
     |   ':' type_expr
             {