diff --git a/php/generate_test_protos.sh b/php/generate_test_protos.sh
index e86ca07a68..cf9e7b2f1f 100755
--- a/php/generate_test_protos.sh
+++ b/php/generate_test_protos.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-set -e
+set -ex
 
 cd `dirname $0`