diff --git a/Dockerfile b/Dockerfile
index 7a19c97..4f558b3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -182,8 +182,9 @@ RUN git clone https://git.kongjian.xin:8443/cartodb/cartodb-4.29.git cartodb &&
     cd cartodb && \
     # Install cartodb extension
     cd lib && \
-    git clone -b 667ec0e32c http://github.com/CartoDB/cartodb-postgresql sql && \
+    git clone http://github.com/CartoDB/cartodb-postgresql sql && \
     cd sql && \
+    git checkout 667ec0e32c && \
     PGUSER=postgres make install && \
     service postgresql start && /bin/su postgres -c \
       /tmp/cartodb_pgsql.sh && service postgresql stop && \