diff --git a/js/ui/shellDBus.js b/js/ui/shellDBus.js
index a87ea4171..4ef03c149 100644
--- a/js/ui/shellDBus.js
+++ b/js/ui/shellDBus.js
@@ -134,7 +134,7 @@ const GnomeShell = new Lang.Class({
             params[param] = params[param].deep_unpack();
 
         let monitorIndex = -1;
-        if (params['monitor'])
+        if (params['monitor'] >= 0)
             monitorIndex = params['monitor'];
 
         let icon = null;