diff --git a/libs/gtkmm2ext/window_proxy.cc b/libs/gtkmm2ext/window_proxy.cc
index ac7c3d6c9d..c307b19213 100644
--- a/libs/gtkmm2ext/window_proxy.cc
+++ b/libs/gtkmm2ext/window_proxy.cc
@@ -211,6 +211,7 @@ WindowProxy::drop_window ()
 		_window = 0;
 		delete vistracker;
 		vistracker = 0;
+		_visible = false;
 	}
 }