diff --git a/pr_testing/setup-pr-test-env.sh b/pr_testing/setup-pr-test-env.sh
index 95d5b00bb3f8..3c2938ea382d 100644
--- a/pr_testing/setup-pr-test-env.sh
+++ b/pr_testing/setup-pr-test-env.sh
@@ -66,6 +66,7 @@ else
   popd
 fi
 export PATH=$CMS_BOT_DIR/das-utils:$PATH
+export MALLOC_CONF=junk:true
 CMSSW_IB=${CMSSW_VERSION}
 CMSSW_QUEUE=$(echo ${CMSSW_VERSION} | sed 's|_X.*|_X|')
 if [ "${UPLOAD_UNIQ_ID}" != "" ] ; then