diff --git a/lib/isc/rwlock.c b/lib/isc/rwlock.c
index 68aaddd685..754c9b6646 100644
--- a/lib/isc/rwlock.c
+++ b/lib/isc/rwlock.c
@@ -15,7 +15,7 @@
  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-/* $Id: rwlock.c,v 1.27 2001/01/09 21:56:26 bwelling Exp $ */
+/* $Id: rwlock.c,v 1.28 2001/02/07 20:03:23 gson Exp $ */
 
 #include <config.h>
 
@@ -301,6 +301,8 @@ isc_rwlock_unlock(isc_rwlock_t *rwl, isc_rwlocktype_t type) {
 	REQUIRE(VALID_RWLOCK(rwl));
 	REQUIRE(rwl->type == type);
 
+	UNUSED(type);
+
 	INSIST(rwl->active > 0);
 	rwl->active--;