diff --git a/tests/scripts/test018-syncreplication-persist b/tests/scripts/test018-syncreplication-persist
index fb384d6778..3fab847f71 100755
--- a/tests/scripts/test018-syncreplication-persist
+++ b/tests/scripts/test018-syncreplication-persist
@@ -65,7 +65,7 @@ done
 
 echo "Using ldapsearch to check that slave slapd is running..."
 for i in 0 1 2 3 4 5; do
-	$LDAPSEARCH -s base -b "$MONITOR" -h $LOCALHOST -p $PORT \
+	$LDAPSEARCH -s base -b "$MONITOR" -h $LOCALHOST -p $SLAVEPORT \
 		'objectclass=*' > /dev/null 2>&1
 	RC=$?
 	if test $RC = 0 ; then