diff --git a/test/run-browsers-smoketests.sh b/test/run-browsers-smoketests.sh
index 1b39c4c..8e3e738 100755
--- a/test/run-browsers-smoketests.sh
+++ b/test/run-browsers-smoketests.sh
@@ -1,4 +1,6 @@
 #!/bin/bash
+set -eo pipefail
+
 echo ""
 echo "Test webextension-polyfill on real browsers"
 echo "==========================================="
diff --git a/test/run-module-bundlers-smoketests.sh b/test/run-module-bundlers-smoketests.sh
index 62a06e3..0a0c6d0 100755
--- a/test/run-module-bundlers-smoketests.sh
+++ b/test/run-module-bundlers-smoketests.sh
@@ -1,4 +1,6 @@
 #!/bin/bash
+set -eo pipefail
+
 echo ""
 echo "Test webextension-polyfill bundled with webpack"
 echo "==============================================="