diff --git a/src/app/startup.sh b/src/app/startup.sh
index 68a7cae..be81a84 100755
--- a/src/app/startup.sh
+++ b/src/app/startup.sh
@@ -80,7 +80,7 @@ EOF
 else
 	sed \
 		-e "s/define('SELF_URL_PATH'.*/define('SELF_URL_PATH','$SELF_URL_PATH');/" \
-		-i.bak $DST_DIR/config.php
+		-i $DST_DIR/config.php
 fi
 
 touch $DST_DIR/.app_is_ready