diff --git a/lib/ns/client.c b/lib/ns/client.c
index 6b00dae889..7e1bde9875 100644
--- a/lib/ns/client.c
+++ b/lib/ns/client.c
@@ -1827,7 +1827,7 @@ ns__client_request(isc_nmhandle_t *handle, isc_result_t eresult,
 			      NS_LOGMODULE_CLIENT, ISC_LOG_DEBUG(1),
 			      "message parsing failed: %s",
 			      isc_result_totext(result));
-		if (result == ISC_R_NOSPACE) {
+		if (result == ISC_R_NOSPACE || result == DNS_R_BADTSIG) {
 			result = DNS_R_FORMERR;
 		}
 		ns_client_error(client, result);