diff --git a/substrate/.maintain/gitlab/check_polkadot_companion_build.sh b/substrate/.maintain/gitlab/check_polkadot_companion_build.sh
index 4b6e45c267..16fb2d3567 100755
--- a/substrate/.maintain/gitlab/check_polkadot_companion_build.sh
+++ b/substrate/.maintain/gitlab/check_polkadot_companion_build.sh
@@ -9,6 +9,7 @@
 # polkadot companion: paritytech/polkadot#567
 #
 
+set -e
 
 github_api_substrate_pull_url="https://api.github.com/repos/paritytech/substrate/pulls"
 # use github api v3 in order to access the data without authentication