diff --git a/uppsrc/IconDes/IconDes.cpp b/uppsrc/IconDes/IconDes.cpp
index a3514713e..3b040c8ff 100644
--- a/uppsrc/IconDes/IconDes.cpp
+++ b/uppsrc/IconDes/IconDes.cpp
@@ -451,7 +451,7 @@ void IconDes::SaveUndo()
 		return;
 	Slot& c = Current();
 	Vector<ImageIml> undo = UnpackImlData(c.undo);
-	int maxn = minmax((single_mode ? 4000000 : 400000) / max(c.image.GetLength(), 1), 4, 128);
+	int maxn = minmax((single_mode ? 4000000 : 400000) / max((int)c.image.GetLength(), 1), 4, 128);
 	while(undo.GetCount() > maxn)
 		undo.Remove(0);
 	if(undo.GetCount() && undo.Top().image == c.image)