diff --git a/modules/profiles/desktop/rc.lua b/modules/profiles/desktop/rc.lua
index c495d9a..6034d02 100644
--- a/modules/profiles/desktop/rc.lua
+++ b/modules/profiles/desktop/rc.lua
@@ -502,7 +502,7 @@ awful.rules.rules = {
       }, properties = { titlebars_enabled = false }
     },
 
-    { rule = { class = "Firefox" },
+    { rule = { class = "firefox" },
       properties = { screen = 1, tag = "2" } },
     { rule = { class = "Signal" },
       properties = { screen = 1, tag = "9" } },