--- /usr/local/etc/rc.d/milter-opendkim 2017-12-20 09:55:49.753794000 +0100
+++ /tmp/milter-opendkim        2017-12-20 09:56:03.436497000 +0100
@@ -178,19 +178,19 @@
 {
     # postcmd is executed too fast and socket is not created before checking...
     sleep 1
-    if [ -S ${milteropendkim_socket##local:} ] ; then
-        chmod ${_piddir_perms} ${milteropendkim_socket##local:}
-    elif [ -S ${milteropendkim_socket##unix:} ] ; then
-        chmod ${_piddir_perms} ${milteropendkim_socket##unix:}
+    if [ -S "${milteropendkim_socket##local:}" ] ; then
+        chmod ${_piddir_perms} "${milteropendkim_socket##local:}"
+    elif [ -S "${milteropendkim_socket##unix:}" ] ; then
+        chmod ${_piddir_perms} "${milteropendkim_socket##unix:}"
     fi
 }
 
 dkim_postcmd()
 {
-    if [ -S ${milteropendkim_socket##local:} ] ; then
-        rm -f ${milteropendkim_socket##local:}
-    elif [ -S ${milteropendkim_socket##unix:} ] ; then
-        rm -f ${milteropendkim_socket##unix:}
+    if [ -S "${milteropendkim_socket##local:}" ] ; then
+        rm -f "${milteropendkim_socket##local:}"
+    elif [ -S "${milteropendkim_socket##unix:}" ] ; then
+        rm -f "${milteropendkim_socket##unix:}"
     fi
     # just if the directory is empty
     rmdir ${_piddir} > /dev/null 2>&1