diff --git a/lib/hx509/crypto.c b/lib/hx509/crypto.c
index d6d2a87c7..46761823c 100644
--- a/lib/hx509/crypto.c
+++ b/lib/hx509/crypto.c
@@ -1031,7 +1031,8 @@ _hx509_private_key2SPKI(hx509_context context,
 {
     const struct signature_alg *md = private_key->md;
     if (md->private_key2SPKI == NULL) {
-	hx509_set_error_string(context, 0, EINVAL, "private key have no key2SPKI function");
+	hx509_set_error_string(context, 0, EINVAL,
+			       "Private key have no key2SPKI function");
 	return EINVAL;
     }
     return (*md->private_key2SPKI)(private_key, spki);