diff --git a/bin/pro-epilog_wrapper.sh b/bin/pro-epilog_wrapper.sh
index ee652c6..de18b01 100755
--- a/bin/pro-epilog_wrapper.sh
+++ b/bin/pro-epilog_wrapper.sh
@@ -7,7 +7,7 @@ SCRIPTNAME=$(basename $0)
 DIRS="/opt/SGE/local/${SCRIPTNAME}.d /usr/local/etc/gridengine/${SCRIPTNAME}.d"
 for DIR in ${DIRS} ; do
 	if [ -d ${DIR} ] ; then
-		if [ ! -z $(ls ${DIR}/[0-9][0-9]*) ] ; then
+		if [ ! -z "$(ls ${DIR}/[0-9][0-9]*)" ] ; then
 			FILES="${FILES} $(ls ${DIR}/[0-9][0-9]*)"
 		fi
 	fi