diff --git a/bin/auto_backup.sh b/bin/auto_backup.sh
index 08176c0..a588f4b 100755
--- a/bin/auto_backup.sh
+++ b/bin/auto_backup.sh
@@ -503,7 +503,7 @@ function clean_backup() {
         if [[ ! ${S3_API_VERSION} == "" ]]; then
             api_args="--api ${S3_API_VERSION}"
         fi
-        ${S3_CLIENT} ${extra_args} alias set ${alias_name} ${BACKUP_S3_ENDPOINT} ${BACKUP_S3_ID} ${BACKUP_S3_KEY} ${api_args}
+        ${S3_CLIENT} ${extra_args} alias set "${alias_name}" "${BACKUP_S3_ENDPOINT}" "${BACKUP_S3_ID}" "${BACKUP_S3_KEY}" ${api_args}
     fi
 
     if [[ "${BACKUP_DATA_PATH_AUTO_TS}" == "no" ]]; then
diff --git a/mo_ctl.sh b/mo_ctl.sh
index 7487174..6536dbc 100755
--- a/mo_ctl.sh
+++ b/mo_ctl.sh
@@ -78,10 +78,10 @@ function main() {
         CTL_LOG_FILE=$CTL_LOG_DIR/$(date '+%Y%m%d_%H%M%S')-$(hostname).log
     fi
     if [ -z "$BACKUP_S3_ID" ] && [ -n "$AWS_ACCESS_KEY_ID" ]; then
-        eval "BACKUP_S3_ID=$AWS_ACCESS_KEY_ID"
+        BACKUP_S3_ID="$AWS_ACCESS_KEY_ID"
     fi
     if [ -z "$BACKUP_S3_KEY" ] && [ -n "$AWS_SECRET_ACCESS_KEY" ]; then
-        eval "BACKUP_S3_KEY=$AWS_SECRET_ACCESS_KEY"
+        BACKUP_S3_KEY="$AWS_SECRET_ACCESS_KEY"
     fi
 
     case "${option_1}" in