diff --git a/run_tests_docker.sh b/run_tests_docker.sh
index 74f84cc0..f7a1843c 100644
--- a/run_tests_docker.sh
+++ b/run_tests_docker.sh
@@ -31,4 +31,4 @@ else
 fi
 
 # run tests
-npm test
+DEBUG=windshaft:renderer:pg_mvt npm test