diff --git a/tools/buildstep.sh b/tools/buildstep.sh
index 76b92c1a..fe06e0d3 100755
--- a/tools/buildstep.sh
+++ b/tools/buildstep.sh
@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+set -e
 
 unset -f filter-lines
 filter-lines()