diff --git a/parse.y b/parse.y
index 16f91a9483..07be7e9907 100644
--- a/parse.y
+++ b/parse.y
@@ -2997,19 +2997,20 @@ rb_parser_ary_free(rb_parser_t *p, rb_parser_ary_t *ary)
                     }
                 ;
 
-%rule f_kw(value) <node_kw_arg>: f_label value
-                                    {
-                                        p->ctxt.in_argdef = 1;
-                                        $$ = new_kw_arg(p, assignable(p, $f_label, $value, &@$), &@$);
-                                    /*% ripper: [$:$, $:value] %*/
-                                    }
-                                | f_label
-                                    {
-                                        p->ctxt.in_argdef = 1;
-                                        $$ = new_kw_arg(p, assignable(p, $f_label, NODE_SPECIAL_REQUIRED_KEYWORD, &@$), &@$);
-                                    /*% ripper: [$:$, 0] %*/
-                                    }
-                                ;
+%rule f_kw(value) <node_kw_arg>
+                : f_label value
+                    {
+                        p->ctxt.in_argdef = 1;
+                        $$ = new_kw_arg(p, assignable(p, $f_label, $value, &@$), &@$);
+                    /*% ripper: [$:$, $:value] %*/
+                    }
+                | f_label
+                    {
+                        p->ctxt.in_argdef = 1;
+                        $$ = new_kw_arg(p, assignable(p, $f_label, NODE_SPECIAL_REQUIRED_KEYWORD, &@$), &@$);
+                    /*% ripper: [$:$, 0] %*/
+                    }
+                ;
 
 %rule f_kwarg(value) <node_kw_arg>
                 : f_kw(value)