diff --git a/lib/isc/netmgr/tlsstream.c b/lib/isc/netmgr/tlsstream.c
index 07f3d26427..f8e0be0d00 100644
--- a/lib/isc/netmgr/tlsstream.c
+++ b/lib/isc/netmgr/tlsstream.c
@@ -245,7 +245,7 @@ tls_send_outgoing(isc_nmsocket_t *sock, bool finish, isc_nmhandle_t *tlshandle,
 	}
 
 	/* TODO Should we keep track of these requests in a list? */
-	if (pending > TLS_BUF_SIZE) {
+	if ((unsigned int)pending > TLS_BUF_SIZE) {
 		pending = TLS_BUF_SIZE;
 	}