diff --git a/g10/sig-check.c b/g10/sig-check.c
--- a/g10/sig-check.c
+++ b/g10/sig-check.c
@@ -779,6 +779,7 @@
   PKT_public_key *pripk = kb->pkt->pkt.public_key;
   gcry_md_hd_t md;
   int signer_alloced = 0;
+  int certification = 0;
 
   rc = openpgp_pk_test_algo (sig->pubkey_algo);
   if (rc)
@@ -816,6 +817,7 @@
            /* Certification revocation.  */
            || sig->sig_class == 0x30)
     {
+      certification = 1;
       if (packet->pkttype != PKT_USER_ID)
         return gpg_error (GPG_ERR_SIG_CLASS);
     }
@@ -890,6 +892,9 @@
                   signer_alloced = 2;
                 }
 
+              if (certification)
+                signer->req_usage = PUBKEY_USAGE_CERT;
+
               rc = get_pubkey (ctrl, signer, sig->keyid);
               if (rc)
                 {