diff --git a/backup.sh b/backup.sh
index ea34f60..8b8d739 100644
--- a/backup.sh
+++ b/backup.sh
@@ -29,7 +29,9 @@ if [ -n "$BACKUP_HELPER_COMMANDS" ]; then
   for pair in "${pairs[@]}"; do
       IFS=":" read -r key value <<< "$pair"
 
-      if ! output=$(restic backup --stdin-filename "$key" --stdin-from-command -- "$value"); then
+      # Split value into array of command args
+      IFS=' ' read -r -a cmd_parts <<< "$value"
+      if ! output=$(restic backup --stdin-filename "$key" --stdin-from-command -- "${cmd_parts[@]}"); then
         exit_code=1;
         echo "Backup of $i failed with exit code $?:"
         echo "$output"