diff --git a/target/start-mailserver.sh b/target/start-mailserver.sh
index a364042d..66f32801 100644
--- a/target/start-mailserver.sh
+++ b/target/start-mailserver.sh
@@ -82,7 +82,7 @@ if [ -f /tmp/docker-mailserver/postfix-regexp.cf ]; then
   # Copying regexp alias file
   echo "Adding regexp alias file postfix-regexp.cf"
   cp /tmp/docker-mailserver/postfix-regexp.cf /etc/postfix/regexp
-  sed -i -e "/^virtual_alias_maps/a|/etc/postfix/regexp|" /tmp/docker-mailserver/target/postfix/main.cf
+  sed -i -e "/^virtual_alias_maps/a|/etc/postfix/regexp|" /etc/postfix/main.cf
 fi
 
 # DKIM