diff --git a/src/core/window.c b/src/core/window.c
index 5039e308d..863027a5e 100644
--- a/src/core/window.c
+++ b/src/core/window.c
@@ -2095,7 +2095,7 @@ windows_overlap (const MetaWindow *w1, const MetaWindow *w2)
 static gboolean
 window_would_be_covered (const MetaWindow *newbie)
 {
-  MetaWorkspace *workspace = newbie->workspace;
+  MetaWorkspace *workspace = meta_window_get_workspace ((MetaWindow *)newbie);
   GList *tmp, *windows;
 
   windows = meta_workspace_list_windows (workspace);