1 files changed, 1 insertions, 0 deletions
diff --git a/src/common.h b/src/common.h
index 88f98b8..f34e9f3 100644
--- a/src/common.h
+++ b/src/common.h
@@ -186,6 +186,7 @@ class T2ToolDefDB;
 class T2ToolDefList;
 class T2ToolIconItem;
 class T2ToolIconList;
+class T2ToolHelpWnd;
 class T2ToolPlugin;
 class T2ToolWindow;
 class T2TowerDoc;