diff --git a/INSTALL/grub/grub.cfg b/INSTALL/grub/grub.cfg
index c5a13080..436b4d5d 100644
--- a/INSTALL/grub/grub.cfg
+++ b/INSTALL/grub/grub.cfg
@@ -1428,7 +1428,7 @@ function ventoy_iso_busybox_ver {
     
         #special process for deepin-live iso
         if [ "$vt_chosen_size" = "403701760" ]; then
-            if vt_str_str "$vt_chosen_path" "/deepin-live"; then
+            if vt_strstr "$vt_chosen_path" "/deepin-live"; then
                 set ventoy_busybox_ver=64
             fi
         elif vt_str_begin "$vt_volume_id" "PHOTON_"; then
@@ -1439,7 +1439,7 @@ function ventoy_iso_busybox_ver {
             set ventoy_busybox_ver=64
         elif vt_str_begin "$vt_volume_id" "KAOS_"; then
             set ventoy_busybox_ver=64
-        elif vt_str_str "$vt_volume_id" "x86_64"; then
+        elif vt_strstr "$vt_volume_id" "x86_64"; then
             set ventoy_busybox_ver=64
 
         fi