diff --git a/postgres-backup-s3/backup.sh b/postgres-backup-s3/backup.sh
index 7bd1d94..c66c19a 100644
--- a/postgres-backup-s3/backup.sh
+++ b/postgres-backup-s3/backup.sh
@@ -1,6 +1,7 @@
 #! /bin/sh
 
 set -e
+set -o pipefail
 
 if [ "${S3_ACCESS_KEY_ID}" = "**None**" ]; then
   echo "You need to set the S3_ACCESS_KEY_ID environment variable."