diff --git a/mrbgems/mruby-data/src/data.c b/mrbgems/mruby-data/src/data.c
index 413c892d8..a708447ae 100644
--- a/mrbgems/mruby-data/src/data.c
+++ b/mrbgems/mruby-data/src/data.c
@@ -149,7 +149,7 @@ mrb_data_new(mrb_state *mrb, mrb_value self)
   }
   else {
     mrb_int argc;
-    mrb_get_args(mrb, "*!", &vals, &argc);
+    mrb_get_args(mrb, "*", &vals, &argc);
     if (n != argc) {
       mrb_raise(mrb, E_ARGUMENT_ERROR, "wrong number of arguments");
     }
diff --git a/mrbgems/mruby-struct/src/struct.c b/mrbgems/mruby-struct/src/struct.c
index 72e4e64bb..2b824320d 100644
--- a/mrbgems/mruby-struct/src/struct.c
+++ b/mrbgems/mruby-struct/src/struct.c
@@ -328,7 +328,7 @@ mrb_struct_initialize(mrb_state *mrb, mrb_value self)
   const mrb_value *argv;
   mrb_int argc;
 
-  mrb_get_args(mrb, "*!", &argv, &argc);
+  mrb_get_args(mrb, "*", &argv, &argc);
   return mrb_struct_initialize_withArg(mrb, argc, argv, self);
 }