diff --git a/ssl/d1_both.c b/ssl/d1_both.c
index a5a7aeb5..2430a7ca 100644
--- a/ssl/d1_both.c
+++ b/ssl/d1_both.c
@@ -670,7 +670,9 @@ dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
 	/* read the body of the fragment (header has already been read */
 	i = s->method->ssl_read_bytes(s,SSL3_RT_HANDSHAKE,
 		frag->fragment + msg_hdr->frag_off,frag_len,0);
-	if (i<=0 || (unsigned long)i!=frag_len)
+	if ((unsigned long)i!=frag_len)
+		i=-1;
+	if (i<=0)
 		goto err;
 
 	RSMBLY_BITMASK_MARK(frag->reassembly, (long)msg_hdr->frag_off,