diff --git a/struct.c b/struct.c
index 75f9add471..9d89134392 100644
--- a/struct.c
+++ b/struct.c
@@ -84,7 +84,7 @@ NORETURN(static void not_a_member(ID id));
 static void
 not_a_member(ID id)
 {
-    rb_name_error(id, "`%s' is not a struct member", rb_id2name(id));
+    rb_name_error(id, "`%"PRIsVALUE"' is not a struct member", QUOTE_ID(id));
 }
 
 VALUE
diff --git a/test/-ext-/struct/test_member.rb b/test/-ext-/struct/test_member.rb
index 002941c95d..89767bfeb4 100644
--- a/test/-ext-/struct/test_member.rb
+++ b/test/-ext-/struct/test_member.rb
@@ -8,5 +8,6 @@ class  Bug::Struct::Test_Member < Test::Unit::TestCase
     s = S.new(1)
     assert_equal(1, s.get(:a))
     assert_raise_with_message(NameError, /is not a struct member/) {s.get(:b)}
+    assert_raise_with_message(NameError, /\u{3042}/) {s.get(:"\u{3042}")}
   end
 end