diff --git a/src/signs.h b/src/signs.h
--- a/src/signs.h
+++ b/src/signs.h
@@ -27,8 +27,6 @@ struct Sign : PoolItem<Sign, SignID, &_S
 	~Sign();
 
 	bool IsValid() const { return this->str != STR_NULL; }
-
-	void QuickFree();
 };
 
 enum {