--- a/src/tree_gui.cpp	Mon May 19 09:45:24 2008 +0000
+++ b/src/tree_gui.cpp	Mon May 19 09:48:47 2008 +0000
@@ -175,7 +175,6 @@
 	WC_BUILD_TREES, WC_NONE,
 	WDF_STD_TOOLTIPS | WDF_STD_BTN | WDF_DEF_WIDGET,
 	_build_trees_widgets,
-	NULL
 };
 
 void ShowBuildTreesToolbar()