diff --git a/src/tree_gui.cpp b/src/tree_gui.cpp
--- a/src/tree_gui.cpp
+++ b/src/tree_gui.cpp
@@ -241,7 +241,7 @@ static const NWidgetPart _nested_build_t
 static const WindowDesc _build_trees_desc(
 	WDP_AUTO, 0, 0,
 	WC_BUILD_TREES, WC_NONE,
-	WDF_UNCLICK_BUTTONS | WDF_CONSTRUCTION,
+	WDF_CONSTRUCTION,
 	_nested_build_trees_widgets, lengthof(_nested_build_trees_widgets)
 );