diff --git a/crypto/buffer/buffer.c b/crypto/buffer/buffer.c
index 40361f966..e67122302 100644
--- a/crypto/buffer/buffer.c
+++ b/crypto/buffer/buffer.c
@@ -244,7 +244,7 @@ void BUF_reverse(unsigned char *out, unsigned char *in, size_t size)
 		{
 		out += size - 1;
 		for (i = 0; i < size; i++)
-			*in++ = *out--;
+			*out-- = *in++;
 		}
 	else
 		{