diff --git a/Dockerfile b/Dockerfile
index 0e00658..cf67f7b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ FROM alpine
 # Change to http respositories, so they we can cache the install packages
 RUN if [ -n ${HTTP_PROXY} ] ; then sed -i -e s'/https/http/' /etc/apk/repositories; fi
 
-RUN apk add --no-cache bash openldap openldap-back-mdb openldap-clients
+RUN apk add --no-cache bash openldap openldap-back-mdb openldap-clients openldap-overlay-syncprov
 
 ADD acl.ldif samba.ldif wurley.ldif /etc/openldap/schema/
 ADD certinfo.ldif /etc/openldap/