diff --git a/gtk/tests/bitmask.c b/gtk/tests/bitmask.c
index 5637d7e870..1d4eaa5121 100644
--- a/gtk/tests/bitmask.c
+++ b/gtk/tests/bitmask.c
@@ -74,6 +74,9 @@ gtk_bitmask_new_parse (const char *string)
 static const char *tests[] = {
                                                                                                                                    "0",
                                                                                                                                    "1",
+                                                                                                     "1000000000000000000000000000000",
+                                                                                                    "10000000000000000000000000000000",
+                                                                     "100000000000000000000000000000000000000000000000000000000000000",
                                                                     "1000000000000000000000000000000000000000000000000000000000000000",
                                                                    "10000000000000000000000000000000000000000000000000000000000000000",
   "1010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010101010",