diff --git a/tools/run_tests/build_python.sh b/tools/run_tests/build_python.sh
index 46e5797f62ea69189438ebf8ebe3ad9c14b3db7d..4abb412c95ac542722f63788c6e875fc1744f103 100755
--- a/tools/run_tests/build_python.sh
+++ b/tools/run_tests/build_python.sh
@@ -7,6 +7,5 @@ cd $(dirname $0)/../..
 
 root=`pwd`
 virtualenv python2.7_virtual_environment
-python2.7_virtual_environment/bin/pip install enum34==1.0.4 futures==2.2.0
-python2.7_virtual_environment/bin/pip install third_party/protobuf/python
+python2.7_virtual_environment/bin/pip install enum34==1.0.4 futures==2.2.0 protobuf==2.6.1
 python2.7_virtual_environment/bin/pip install src/python