diff --git a/wolfcrypt/src/blake2b.c b/wolfcrypt/src/blake2b.c
index a974c0931..debcfa38e 100644
--- a/wolfcrypt/src/blake2b.c
+++ b/wolfcrypt/src/blake2b.c
@@ -358,7 +358,7 @@ int blake2b_final( blake2b_state *S, byte *out, byte outlen )
     S->buflen -= BLAKE2B_BLOCKBYTES;
     if ( S->buflen > BLAKE2B_BLOCKBYTES )
       return BAD_LENGTH_E;
-    XMEMCPY( S->buf, S->buf + BLAKE2B_BLOCKBYTES, (wolfssl_word)S->buflen );
+    XMEMMOVE( S->buf, S->buf + BLAKE2B_BLOCKBYTES, (wolfssl_word)S->buflen );
   }
 
   blake2b_increment_counter( S, S->buflen );