diff --git a/backup.sh b/backup.sh
index fcb60b0..137309d 100755
--- a/backup.sh
+++ b/backup.sh
@@ -205,7 +205,7 @@ do
 done
 
 DATE=$(date '+%Y.%m.%d')
-DATEOLD="date --date=$TIME_REMOVED_DUMP_FILES +%Y.%m.%d"
+DATEOLD="date --date='$TIME_REMOVED_DUMP_FILES +%Y.%m.%d'"
 DST=$BACKUP_DIR/$DATE
 DSTOLD=$BACKUP_DIR/$($DATEOLD)