diff --git a/ssl/ssl_locl.h b/ssl/ssl_locl.h
index 49425d8572fd3de7c751645588435d5be36ec09d..7a8a303648cde9a5b9f248369051e6fa1a851b2a 100644
--- a/ssl/ssl_locl.h
+++ b/ssl/ssl_locl.h
@@ -670,7 +670,7 @@ struct ssl_session_st {
     /* RFC4507 info */
     unsigned char *tlsext_tick; /* Session ticket */
     size_t tlsext_ticklen;      /* Session ticket length */
-    long tlsext_tick_lifetime_hint; /* Session lifetime hint in seconds */
+    unsigned long tlsext_tick_lifetime_hint; /* Session lifetime hint in seconds */
 # endif
 # ifndef OPENSSL_NO_SRP
     char *srp_username;