diff --git a/CCallback.h b/CCallback.h
index 919d0bb7c..db60124b2 100644
--- a/CCallback.h
+++ b/CCallback.h
@@ -35,6 +35,7 @@ class IShipyard;
 struct CGPathNode;
 struct CGPath;
 struct CPathsInfo;
+struct CPack;
 
 class IBattleCallback
 {