diff --git a/src/game/AI/BaseAI/UnitAI.h b/src/game/AI/BaseAI/UnitAI.h
index 0778aad920..b66c702a39 100644
--- a/src/game/AI/BaseAI/UnitAI.h
+++ b/src/game/AI/BaseAI/UnitAI.h
@@ -631,7 +631,7 @@ struct CreatureAIFactory : public SelectableAI
 
     UnitAI* Create(void*) const override;
 
-    int Permit(const Creature* c) const { return REAL_AI::Permissible(c); }
+    int Permit(const Creature* c) const override { return REAL_AI::Permissible(c); }
 };
 
 enum Permitions