diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index c45e179ab..0546b2a24 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -3986,7 +3986,7 @@ p_value         : p_var
                     }
                 | tSTRING
                     {
-                      $$ = new_pat_value(p, $1);
+                      $$ = new_pat_value(p, new_str(p, list1($1)));
                     }
                 | keyword_nil
                     {
diff --git a/mrbgems/mruby-compiler/core/y.tab.c b/mrbgems/mruby-compiler/core/y.tab.c
index ee314d4e3..8eacb67a8 100644
--- a/mrbgems/mruby-compiler/core/y.tab.c
+++ b/mrbgems/mruby-compiler/core/y.tab.c
@@ -10540,7 +10540,7 @@ yyreduce:
   case 456: /* p_value: tSTRING  */
 #line 3988 "mrbgems/mruby-compiler/core/parse.y"
                     {
-                      (yyval.nd) = new_pat_value(p, (yyvsp[0].nd));
+                      (yyval.nd) = new_pat_value(p, new_str(p, list1((yyvsp[0].nd))));
                     }
 #line 10546 "mrbgems/mruby-compiler/core/y.tab.c"
     break;