diff --git a/acme.sh b/acme.sh
index a5ac9e47..e32693b1 100755
--- a/acme.sh
+++ b/acme.sh
@@ -3168,7 +3168,7 @@ _checkConf() {
       for included in $(cat "$2" | tr "\t" " " | grep "^ *include *.*;" | sed "s/include //" | tr -d " ;"); do
         _debug "check included $included"
         if ! _startswith "$included" "/" && _exists dirname; then
-          _relpath="$(dirname "$_c_file")"
+          _relpath="$(dirname "$2")"
           _debug "_relpath" "$_relpath"
           included="$_relpath/$included"
         fi