diff --git a/kokoro/linux/python35_cpp/build.sh b/kokoro/linux/python35_cpp/build.sh
index 2a79246..4d0dbd4 100755
--- a/kokoro/linux/python35_cpp/build.sh
+++ b/kokoro/linux/python35_cpp/build.sh
@@ -11,7 +11,7 @@
 cd $(dirname $0)/../../..
 
 export DOCKERHUB_ORGANIZATION=protobuftesting
-export DOCKERFILE_DIR=kokoro/linux/dockerfile/test/python_stretch
+export DOCKERFILE_DIR=kokoro/linux/dockerfile/test/python35
 export DOCKER_RUN_SCRIPT=kokoro/linux/pull_request_in_docker.sh
 export OUTPUT_DIR=testoutput
 export TEST_SET="python35_cpp"