diff --git a/config b/config
index ac4753e..c57ef80 100644
--- a/config
+++ b/config
@@ -199,7 +199,7 @@ bindsym XF86MonBrightnessDown exec xbacklight -dec 20 # decrease screen brightne
 
 #force mpv to window 4
 assign [class="mpv"] $workspace4
-assign [class="firefox"] $workspace2
+assign [class="^Firefox$":] $workspace2
 
 bindsym $mod+x exec i3lock
 bindsym $mod+b exec firefox