diff --git a/Dockerfile b/Dockerfile
index bbabdf8..6ea3b46 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,9 @@
 RUN mkdir -p cvp-configuration
 
 RUN git clone https://github.com/openstack/tempest && \
-    pushd tempest; git checkout 18.0.0; pip install -r requirements.txt; \
+    pushd tempest; git checkout 18.0.0; \
+    sed -i 's/length=15/length=32/g' /var/lib/tempest/tempest/lib/common/utils/data_utils.py; \
+    pip install -r requirements.txt; \
     popd;
 
 RUN git clone https://github.com/openstack/heat-tempest-plugin && \
@@ -20,8 +22,6 @@
 
 RUN pip install --force-reinstall python-cinderclient==3.2.0 python-glanceclient==2.11
 
-RUN sed -i 's/length=15/length=32/g' /var/lib/tempest/tempest/lib/common/utils/data_utils.py
-RUN sed -i 's/length=15/length=32/g' /usr/local/lib/python2.7/dist-packages/tempest/lib/common/utils/data_utils.py
 RUN sed -i 's/uuid4())/uuid4()).replace("-","")/g' /usr/local/lib/python2.7/dist-packages/rally/plugins/openstack/scenarios/keystone/utils.py
 RUN sed -i 's/uuid4())/uuid4()).replace("-","")/g' /usr/local/lib/python2.7/dist-packages/rally/plugins/openstack/context/keystone/users.py