diff --git a/scripts/tests/test_suites.sh b/scripts/tests/test_suites.sh
index 38e0bfd75ed3f3..f335fe539db21e 100755
--- a/scripts/tests/test_suites.sh
+++ b/scripts/tests/test_suites.sh
@@ -16,8 +16,13 @@
 # limitations under the License.
 #
 
+# Fail if one of our sub-commands fails.
 set -e
 
+# Fail if anything in a pipeline fails, not just the last command (which for
+# us tends to be 'tee').
+set -o pipefail
+
 declare -i iterations=2
 declare -i delay=0
 declare -i node_id=0x12344321