diff --git a/mysql-backup-s3/run.sh b/mysql-backup-s3/run.sh
index 8cc86cc..e3fb3c8 100644
--- a/mysql-backup-s3/run.sh
+++ b/mysql-backup-s3/run.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-if [ "${S3_S3V4}" = "yes"]; then
+if [ "${S3_S3V4}" = "yes" ]; then
     aws configure set default.s3.signature_version s3v4
 fi