diff --git a/src/zen/workspaces/ZenWorkspaces.mjs b/src/zen/workspaces/ZenWorkspaces.mjs
index bbcfd4cf5..35a6b97df 100644
--- a/src/zen/workspaces/ZenWorkspaces.mjs
+++ b/src/zen/workspaces/ZenWorkspaces.mjs
@@ -920,7 +920,7 @@ var ZenWorkspaces = new (class extends ZenMultiWindowFeature {
         this.onContextMenuClose(event);
       }
     });
-    contextMenu.addEventListener('onpopupshowing', this.updateContextMenu.bind(this));
+    contextMenu.addEventListener('popupshowing', this.updateContextMenu.bind(this));
     contextMenu.addEventListener('command', this.handleContextMenuCommand.bind(this));
 
     const submenu = document.querySelector('#context_zenWorkspacesOpenInContainerTab > menupopup');