diff --git a/scripts/admin/copy-dev-bundle-from-jenkins.sh b/scripts/admin/copy-dev-bundle-from-jenkins.sh
index e60b669e7f..90b89ba240 100755
--- a/scripts/admin/copy-dev-bundle-from-jenkins.sh
+++ b/scripts/admin/copy-dev-bundle-from-jenkins.sh
@@ -33,10 +33,13 @@ fi
 
 echo Found build $DIRNAME
 
+trap "echo Found surprising number of tarballs." EXIT
 # Check to make sure the proper number of each kind of file is there.
 s3cmd ls s3://com.meteor.jenkins/$DIRNAME/ | \
   perl -nle 'if (/\.tar\.gz/) { ++$TAR } else { die "something weird" }  END { exit !($TAR == 4) }'
 
+trap - EXIT
+
 for FILE in $(s3cmd ls s3://com.meteor.jenkins/$DIRNAME/ | perl -nlaF/ -e 'print $F[-1]'); do
    if s3cmd info $TARGET$FILE >/dev/null 2>&1; then
      echo "$TARGET$FILE already exists (maybe from another branch?)"