diff --git a/spring-webflow-samples/booking-portlet-mvc/ivy.xml b/spring-webflow-samples/booking-portlet-mvc/ivy.xml
index 9fc48dda..99d4902d 100644
--- a/spring-webflow-samples/booking-portlet-mvc/ivy.xml
+++ b/spring-webflow-samples/booking-portlet-mvc/ivy.xml
@@ -26,6 +26,7 @@
 		<dependency org="javax.servlet" name="jstl" rev="1.1.2" conf="compile->default"/>
 		<dependency org="org.aopalliance" name="aopalliance" rev="1.0" conf="compile->default"/>
 		<dependency org="org.apache" name="commons-codec" rev="1.3" conf="compile->default"/>
+		<dependency org="org.apache.commons" name="commons-collections" rev="3.2" conf="compile->default" />
 		<dependency org="org.springframework.webflow" name="spring-faces" rev="latest.integration" conf="compile->compile"/>
 		<dependency org="org.springframework.webflow" name="spring-webflow" rev="latest.integration" conf="compile->compile"/>
 		<dependency org="org.springframework" name="spring-aop" rev="2.5.2" conf="compile->default"/>