diff --git a/run-document-server.sh b/run-document-server.sh
index fd183a3..f290e8d 100755
--- a/run-document-server.sh
+++ b/run-document-server.sh
@@ -199,7 +199,7 @@ parse_rabbitmq_url(){
   # extract the host
   local hostport="$(echo ${url/$userpass@/} | cut -d/ -f1)"
   # by request - try to extract the port
-  local port="$(echo $hostport | sed -e 's,^.*:,:,g' -e 's,.*:\([0-9]*\).*,\1,g' -e 's,[^0-9],,g')"
+  local port="$(echo $hostport | grep : | sed -r 's_^.*:+|/.*$__g')"
 
   local host
   if [ -n "$port" ]; then