diff --git a/md1.komreg.net/overlay/usr/local/bin/mirror-mdq.sh b/md1.komreg.net/overlay/usr/local/bin/mirror-mdq.sh
index 6e819987..a8c513c7 100755
--- a/md1.komreg.net/overlay/usr/local/bin/mirror-mdq.sh
+++ b/md1.komreg.net/overlay/usr/local/bin/mirror-mdq.sh
@@ -4,8 +4,8 @@ base=$1
 target=$2
 dir=`mktemp -d`
 
-if [ -z $MIRROR_MDQ_POST ]; then
-   MIRROR_MDQ_POST=/etc/mirror-mdq/post.d
+if [ "x${MIRROR_MDQ_POST}" = "x" ]; then
+   export MIRROR_MDQ_POST="/etc/mirror-mdq/post.d"
 fi
 
 function cleanup() {
@@ -19,8 +19,8 @@ mkdir -p $target && (
  WGET_ARGS="--mirror --no-host-directories -q"
  idx_obj=".well-known/webfinger?rel=urn:oasis:names:tc:SAML:2.0:metadata"
  wget $WGET_ARGS "$base/$idx_obj" && jq -r '.links[].href' < "$idx_obj" | wget $WGET_ARGS -i -
- if [ -d $MIRROR_MDQ_POST ]; then
-    env SOURCE=$1 TARGET=$target IDX_OBJ=$idx_obj run-parts $MIRROR_MDQ_POST
+ if [ -d "${MIRROR_MDQ_POST}" ]; then
+    env SOURCE=$1 TARGET=$target IDX_OBJ=$idx_obj run-parts ${MIRROR_MDQ_POST}
  fi
 )