diff --git a/app/dialplan/resources/switch/conf/dialplan/470_valet_park.xml b/app/dialplan/resources/switch/conf/dialplan/470_valet_park.xml
index 8391db87ab..1d8e5e3d75 100644
--- a/app/dialplan/resources/switch/conf/dialplan/470_valet_park.xml
+++ b/app/dialplan/resources/switch/conf/dialplan/470_valet_park.xml
@@ -9,7 +9,7 @@
 			<action application="set" data="park_lot=$2" inline="true"/>
 		</condition>
 		<condition field="destination_number" expression="^(park\+)?(\*59[0-9][0-9])$"/>
-		<condition field="${cond ${sip_h_Referred-By} == 0 ? false : true}" expression="true" break="never">
+		<condition field="${cond ${sip_h_Referred-By} == '' ? false : true}" expression="true" break="never">
 			<action application="set" data="park_in_use=${regex ${valet_info park@${domain_name}}|${park_lot}}" inline="true"/>
 		</condition>
 		<condition field="${park_in_use}" expression="true" break="never">