diff --git a/doc/gpg.texi b/doc/gpg.texi
index 2361af6d5..ab3912fc5 100644
--- a/doc/gpg.texi
+++ b/doc/gpg.texi
@@ -1651,10 +1651,10 @@ certification level below this as invalid. Defaults to 2, which
 disregards level 1 signatures. Note that level 0 "no particular
 claim" signatures are always accepted.
 
-@item --trusted-key @var{long key ID}
+@item --trusted-key @var{long key ID or fingerprint}
 @opindex trusted-key
 Assume that the specified key (which must be given
-as a full 8 byte key ID) is as trustworthy as one of
+as a full 8 byte key ID or 20 byte fingerprint) is as trustworthy as one of
 your own secret keys. This option is useful if you
 don't want to keep your secret keys (or one of them)
 online but still want to be able to check the validity of a given
diff --git a/g10/trustdb.c b/g10/trustdb.c
index 64e6ec349..00a53e0ea 100644
--- a/g10/trustdb.c
+++ b/g10/trustdb.c
@@ -205,22 +205,34 @@ tdb_register_trusted_keyid (u32 *keyid)
   user_utk_list = k;
 }
 
+
 void
-tdb_register_trusted_key( const char *string )
+tdb_register_trusted_key (const char *string)
 {
   gpg_error_t err;
   KEYDB_SEARCH_DESC desc;
+  u32 kid[2];
 
   err = classify_user_id (string, &desc, 1);
-  if (err || desc.mode != KEYDB_SEARCH_MODE_LONG_KID )
+  if (!err)
     {
-      log_error(_("'%s' is not a valid long keyID\n"), string );
-      return;
+      if (desc.mode == KEYDB_SEARCH_MODE_LONG_KID)
+        {
+          register_trusted_keyid (desc.u.kid);
+          return;
+        }
+      if (desc.mode == KEYDB_SEARCH_MODE_FPR && desc.fprlen == 20)
+        {
+          kid[0] = buf32_to_u32 (desc.u.fpr+12);
+          kid[1] = buf32_to_u32 (desc.u.fpr+16);
+          register_trusted_keyid (kid);
+          return;
+        }
     }
-
-  register_trusted_keyid(desc.u.kid);
+  log_error (_("'%s' is not a valid long keyID\n"), string );
 }
 
+
 /*
  * Helper to add a key to the global list of ultimately trusted keys.
  * Returns: true = inserted, false = already in list.