diff --git a/postgresql.sh b/postgresql.sh
index 49982a5..a06b85c 100644
--- a/postgresql.sh
+++ b/postgresql.sh
@@ -31,5 +31,7 @@ case $1 in
     rm -f ${pid}
     daemonize -u ${user} -c ${PGDATA} -o ${log} -a -e ${log} \
               /usr/bin/postgres
+
+    su - postgres -c "echo 'create extension if not exists pgcrypto;' | psql -U postgres"
     ;;
 esac