diff --git a/kmail.kcfg b/kmail.kcfg
index 6fbdb6697..12c910413 100644
--- a/kmail.kcfg
+++ b/kmail.kcfg
@@ -96,7 +96,7 @@
           <choice name="MB"/>
           <choice name="GB"/>
         </choices>
-        <default>KB</default>
+        <default>MB</default>
       </entry>
     </group>