diff --git a/g10/ChangeLog b/g10/ChangeLog
index ac769b76a..80de445cb 100644
--- a/g10/ChangeLog
+++ b/g10/ChangeLog
@@ -1,3 +1,8 @@
+2008-03-18  Werner Koch  <wk@g10code.com>
+
+	* seckey-cert.c (do_check): Use GCRYMPI_FMT_PGP for v3 keys.
+	Reported by Petr Cerny.
+
 2008-03-13  Werner Koch  <wk@g10code.com>
 
 	* passphrase.c (PROMPTSTRING): Change string to me more similar to
diff --git a/g10/seckey-cert.c b/g10/seckey-cert.c
index f0dde2caf..841421d94 100644
--- a/g10/seckey-cert.c
+++ b/g10/seckey-cert.c
@@ -209,7 +209,7 @@ do_check( PKT_secret_key *sk, const char *tryagain_text, int mode,
                 csum += checksum (buffer, ndata);
                 gcry_mpi_release (sk->skey[i]);
 
-		err = gcry_mpi_scan( &sk->skey[i], GCRYMPI_FMT_USG,
+		err = gcry_mpi_scan( &sk->skey[i], GCRYMPI_FMT_PGP,
 				     buffer, ndata, &ndata );
 		xfree (buffer);
                 if (err)