diff --git a/phpsg.sh b/phpsg.sh
index a272f47..9ad3f96 100755
--- a/phpsg.sh
+++ b/phpsg.sh
@@ -22,6 +22,8 @@
 # 3. This notice may not be removed or altered from any source
 #    distribution.
 
+set -euo pipefail
+
 SOURCE_DIR="src"
 OUTPUT_DIR="output"