diff --git a/t/Uptime.t b/t/Uptime.t
index 9a74ffab4..9a37cfdc3 100644
--- a/t/Uptime.t
+++ b/t/Uptime.t
@@ -61,7 +61,8 @@ ddg_goodie_test(
     # Misc bad queries
     'uptime 99.99' => undef,
     'uptime ninety-nine' => undef,
-    'up time 99%' => undef
+    'up time 99%' => undef,
+    'up time 99%%' => undef
 );
 
 done_testing;