diff --git a/sway/behaviours b/sway/behaviours
index 4f3365328..43a432be0 100644
--- a/sway/behaviours
+++ b/sway/behaviours
@@ -68,7 +68,6 @@ for_window [class="Tlpui"] floating enable
 for_window [title="XTerm"] floating enable
 for_window [class="Gvim"] floating enable
 for_window [class="Orage"] floating enable
-for_window [class="Claws-mail"] layout stacking
 for_window [class="Vncviewer"] fullscreen enable
 for_window [app_id="nm-connection-editor"] floating enable