diff --git a/gerrit-server/src/main/prolog/gerrit_common.pl b/gerrit-server/src/main/prolog/gerrit_common.pl
index 2a45819..9a4e77c 100644
--- a/gerrit-server/src/main/prolog/gerrit_common.pl
+++ b/gerrit-server/src/main/prolog/gerrit_common.pl
@@ -283,6 +283,7 @@
 %% - The maximum is never used.
 %%
 any_with_block(Label, Min, reject(Who)) :-
+  Min < 0,
   check_label_range_permission(Label, Min, ok(Who)),
   !
   .