diff --git a/source/libs/fatfs/diskio.c b/source/libs/fatfs/diskio.c
index 7f83019..62d8373 100644
--- a/source/libs/fatfs/diskio.c
+++ b/source/libs/fatfs/diskio.c
@@ -108,7 +108,7 @@ static inline int _emmc_xts(u32 ks1, u32 ks2, u32 enc, u8 *tweak, bool regen_twe
         pdst += 0x10;
     }
 
-    se_aes_crypt_ecb(ks2, enc, dst, secsize, src, secsize);
+    se_aes_crypt_ecb(ks2, enc, dst, secsize, dst, secsize);
 
     pdst = (u8 *)dst;