diff --git a/unittests.sh b/unittests.sh
index 3dfef3760..04fcc94ba 100755
--- a/unittests.sh
+++ b/unittests.sh
@@ -1,3 +1,6 @@
+#!/bin/bash
+set -e
+
 nosetests --cover-inclusive --cover-erase --cover-package=dvc --with-coverage
 
 if [ "$1" = "report" ]; then