diff --git a/tools/buildgen/generate_projects.sh b/tools/buildgen/generate_projects.sh
index d37288a078c..7a12440db2c 100755
--- a/tools/buildgen/generate_projects.sh
+++ b/tools/buildgen/generate_projects.sh
@@ -40,6 +40,8 @@ cd `dirname $0`/../..
 mako_renderer=tools/buildgen/mako_renderer.py
 gen_build_json=test/core/end2end/gen_build_json.py
 
+tools/buildgen/build-cleaner.py build.json
+
 end2end_test_build=`mktemp /tmp/genXXXXXX`
 $gen_build_json > $end2end_test_build