diff --git a/src/gpgme.h.in b/src/gpgme.h.in
index c07cac8d..79a7b9fd 100644
--- a/src/gpgme.h.in
+++ b/src/gpgme.h.in
@@ -648,10 +648,10 @@ struct _gpgme_tofu_info
   /* Number of encryptions done with this binding.  Capped at USHRT_MAX.  */
   unsigned short encrcount;
 
-  /* Number of seconds since the first and the most recently seen
-   * message was verified.  */
-  unsigned int firstseen;
-  unsigned int lastseen;
+  /* Number of seconds since Epoch when the first and the most
+   * recently seen message were verified.  0 means unknown. */
+  unsigned long firstseen;
+  unsigned long lastseen;
 
   /* If non-NULL a human readable string summarizing the TOFU data. */
   char *description;
diff --git a/src/verify.c b/src/verify.c
index e573b016..92eb3334 100644
--- a/src/verify.c
+++ b/src/verify.c
@@ -818,20 +818,16 @@ parse_tofu_stats (gpgme_signature_t sig, char *args)
   if (nfields == 4)
     return 0; /* No more optional fields.  */
 
-  /* Parse first and last seen (none or both are required).  */
+  /* Parse first and last seen timestamps (none or both are required).  */
   if (nfields < 6)
     return trace_gpg_error (GPG_ERR_INV_ENGINE); /* "tm2" missing.  */
   err = _gpgme_strtoul_field (field[4], &uval);
   if (err)
     return trace_gpg_error (GPG_ERR_INV_ENGINE);
-  if (uval > UINT_MAX)
-    uval = UINT_MAX;
   ti->firstseen = uval;
   err = _gpgme_strtoul_field (field[5], &uval);
   if (err)
     return trace_gpg_error (GPG_ERR_INV_ENGINE);
-  if (uval > UINT_MAX)
-    uval = UINT_MAX;
   ti->lastseen = uval;
 
   return 0;