diff --git a/src/grub2/hiperiso_cmd.c b/src/grub2/hiperiso_cmd.c
index 1c6d1ef..cc0187c 100644
--- a/src/grub2/hiperiso_cmd.c
+++ b/src/grub2/hiperiso_cmd.c
@@ -629,7 +629,7 @@ static int hiperiso_check_official_device(grub_device_t dev)
         {
             hiperiso_gpt_part_tbl *PartTbl = g_hiperiso_part_info->PartTbl;
             if (PartTbl[1].StartLBA != PartTbl[0].LastLBA + 1 ||
-                (PartTbl[1].LastLBA + 1 - PartTbl[1].StartLBA) != 131072)
+                (PartTbl[1].LastLBA + 1 - PartTbl[1].StartLBA) != 65536)
             {
                 grub_file_close(file);
                 return hiperiso_set_check_result(6, "Disk partition layout check failed.");
@@ -639,7 +639,7 @@ static int hiperiso_check_official_device(grub_device_t dev)
         {
             hiperiso_part_table *PartTbl = g_hiperiso_part_info->MBR.PartTbl;
             if (PartTbl[1].StartSectorId != PartTbl[0].StartSectorId + PartTbl[0].SectorCount ||
-                PartTbl[1].SectorCount != 131072)
+                PartTbl[1].SectorCount != 65536)
             {
                 grub_file_close(file);
                 return hiperiso_set_check_result(6, "Disk partition layout check failed.");
@@ -650,7 +650,7 @@ static int hiperiso_check_official_device(grub_device_t dev)
     {
         offset = partition->start + partition->len;
         partition = file->device->disk->partition;
-        if ((partition->number != 1) || (partition->len != 131072) || (offset != partition->start))
+        if ((partition->number != 1) || (partition->len != 65536) || (offset != partition->start))
         {
             grub_file_close(file);
             return hiperiso_set_check_result(7, "Disk partition layout check failed.");
diff --git a/src/grub2/hiperiso_def.h b/src/grub2/hiperiso_def.h
index 07fa7eb..168410b 100644
--- a/src/grub2/hiperiso_def.h
+++ b/src/grub2/hiperiso_def.h
@@ -1217,7 +1217,7 @@ int hiperiso_unregister_all_cmd(void);
 int hiperiso_chain_file_size(const char *path);
 int hiperiso_chain_file_read(const char *path, int offset, int len, void *buf);
 
-#define HISO_CMD_CHECK(a) if (67108864 != g_hiperiso_disk_part_size[a]) hiperiso_syscall0(exit)
+#define HISO_CMD_CHECK(a) if (33554432 != g_hiperiso_disk_part_size[a]) hiperiso_syscall0(exit)
 
 #define hiso_theme_random_boot_second  0
 #define hiso_theme_random_boot_day     1