diff --git a/src/saveload/oldloader_sl.cpp b/src/saveload/oldloader_sl.cpp
--- a/src/saveload/oldloader_sl.cpp
+++ b/src/saveload/oldloader_sl.cpp
@@ -651,7 +651,7 @@ static bool LoadOldAnimTileList(Loadgame
 	/* The first zero in the loaded array indicates the end of the list. */
 	for (int i = 0; i < 256; i++) {
 		if (anim_list[i] == 0) break;
-		*_animated_tiles.Append() = anim_list[i];
+		_animated_tiles.push_back(anim_list[i]);
 	}
 
 	return true;