diff --git a/js/ui/windowManager.js b/js/ui/windowManager.js
index bd47e6e5d..166480db8 100644
--- a/js/ui/windowManager.js
+++ b/js/ui/windowManager.js
@@ -1141,6 +1141,10 @@ var WindowManager = class {
     }
 
     _minimizeWindow(shellwm, actor) {
+        const window = actor.meta_window;
+        if (window.is_attached_dialog())
+            this._checkDimming(window.get_transient_for());
+
         const types = [
             Meta.WindowType.NORMAL,
             Meta.WindowType.MODAL_DIALOG,