diff --git a/g10/sig-check.c b/g10/sig-check.c
index 087222a7e..ee0ebcb2b 100644
--- a/g10/sig-check.c
+++ b/g10/sig-check.c
@@ -1087,7 +1087,8 @@ check_key_signature2 (kbnode_t root, kbnode_t node, PKT_public_key *check_pk,
       }
   else
     {
-      log_info ("sig issued by %s with class %d (digest: %x %x) is not valid over a user id or a key id, ignoring.\n",
+      log_info ("sig issued by %s with class %d (digest: %02x %02x)"
+                " is not valid over a user id or a key id, ignoring.\n",
                 keystr (sig->keyid), sig->sig_class,
                 sig->digest_start[0], sig->digest_start[1]);
       rc = gpg_error (GPG_ERR_BAD_SIGNATURE);