diff --git a/rc.lua b/rc.lua
index 4f55103..7e786c1 100644
--- a/rc.lua
+++ b/rc.lua
@@ -576,7 +576,7 @@ awful.rules.rules = {
     { rule = { class = "Firefox" },
       callback = function(c) awful.client.movetotag(tags[mouse.screen][2], c) end },
     { rule = { class = "Thunderbird" },
-      callback = function(c) awful.client.movetotag(tags[mouse.screen][2], c) end },
+      callback = function(c) awful.client.movetotag(tags[mouse.screen][5], c) end },
     { rule = { class = "Geary" },
       callback = function(c) awful.client.movetotag(tags[mouse.screen][5], c) end },
     { rule = { class = "Liferea" },