diff --git a/tools/api_refs/api_refs.sh b/tools/api_refs/api_refs.sh
index 26efb47fe2..d0a3a8333c 100755
--- a/tools/api_refs/api_refs.sh
+++ b/tools/api_refs/api_refs.sh
@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 
 set +x;
+set -e;
 
 AUTH_JSON=$(realpath ${1:-~/.composer/auth.json}); # Path to an auth.json file allowing to install the targeted edition and version
 PHP_API_OUTPUT_DIR=${2:-./docs/api/php_api/php_api_reference}; # Path to the directory where the built PHP API Reference is hosted