diff --git a/lib/dns/xfrin.c b/lib/dns/xfrin.c
index cd50bfe4d3..cffb324df2 100644
--- a/lib/dns/xfrin.c
+++ b/lib/dns/xfrin.c
@@ -15,7 +15,7 @@
  * SOFTWARE.
  */
 
-/* $Id: xfrin.c,v 1.84 2000/07/21 23:00:29 bwelling Exp $ */
+/* $Id: xfrin.c,v 1.85 2000/07/24 05:30:30 bwelling Exp $ */
 
 #include <config.h>
 
@@ -866,6 +866,12 @@ xfrin_send_request(dns_xfrin_ctx_t *xfr) {
 
 	CHECK(render(msg, &xfr->qbuffer));
 
+	/*
+	 * Free the last tsig, if there is one.
+	 */
+	if (xfr->lasttsig != NULL)
+		isc_buffer_free(&xfr->lasttsig);
+
 	/*
 	 * Save the query TSIG and don't let message_destroy free it.
 	 */