diff --git a/ssl/t1_lib.c b/ssl/t1_lib.c
index 22a368d..83e493e 100644
--- a/ssl/t1_lib.c
+++ b/ssl/t1_lib.c
@@ -1311,10 +1311,11 @@
     p = sdec;
 
     sess = d2i_SSL_SESSION(NULL, &p, slen);
+    slen -= p - sdec;
     OPENSSL_free(sdec);
     if (sess) {
         /* Some additional consistency checks */
-        if (p != sdec + slen || sess->session_id_length != 0) {
+        if (slen != 0 || sess->session_id_length != 0) {
             SSL_SESSION_free(sess);
             return TICKET_NO_DECRYPT;
         }