diff --git a/infra/base-images/base-runner/bad_build_check b/infra/base-images/base-runner/bad_build_check
index a570dd92e..4aa6279d7 100755
--- a/infra/base-images/base-runner/bad_build_check
+++ b/infra/base-images/base-runner/bad_build_check
@@ -1,4 +1,4 @@
-#!/bin/bash -u
+#!/bin/bash -ux
 # Copyright 2017 Google Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
@@ -171,6 +171,7 @@ function check_mixed_sanitizers {
 
 function main {
   local FUZZER=$1
+  echo "INFO: performing bad build checks for $FUZZER"
 
   check_instrumentation $FUZZER
   check_mixed_sanitizers $FUZZER