diff --git a/lib/isc/netmgr/netmgr-int.h b/lib/isc/netmgr/netmgr-int.h
index 25bc544396..bf90e1512a 100644
--- a/lib/isc/netmgr/netmgr-int.h
+++ b/lib/isc/netmgr/netmgr-int.h
@@ -71,11 +71,6 @@
 		 ? ISC_NETMGR_UDP_RECVBUF_SIZE                      \
 		 : ISC_NETMGR_TCP_RECVBUF_SIZE)
 
-/*
- * Send buffer
- */
-#define ISC_NETMGR_SENDBUF_SIZE (sizeof(uint16_t) + UINT16_MAX)
-
 /*
  * Make sure our RECVBUF size is large enough
  */
@@ -193,7 +188,6 @@ typedef struct isc__networker {
 	bool shuttingdown;
 
 	char *recvbuf;
-	char *sendbuf;
 	bool recvbuf_inuse;
 
 	ISC_LIST(isc_nmsocket_t) active_sockets;
diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index aea9261e5e..43610b092c 100644
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -230,8 +230,6 @@ isc_netmgr_create(isc_mem_t *mctx, isc_loopmgr_t *loopmgr, isc_nm_t **netmgrp) {
 		*worker = (isc__networker_t){
 			.recvbuf = isc_mem_get(loop->mctx,
 					       ISC_NETMGR_RECVBUF_SIZE),
-			.sendbuf = isc_mem_get(loop->mctx,
-					       ISC_NETMGR_SENDBUF_SIZE),
 			.active_sockets = ISC_LIST_INITIALIZER,
 		};
 
@@ -2320,7 +2318,6 @@ isc__networker_destroy(isc__networker_t *worker) {
 
 	isc_mempool_destroy(&worker->uvreq_pool);
 
-	isc_mem_put(worker->mctx, worker->sendbuf, ISC_NETMGR_SENDBUF_SIZE);
 	isc_mem_putanddetach(&worker->mctx, worker->recvbuf,
 			     ISC_NETMGR_RECVBUF_SIZE);
 	isc_nm_detach(&netmgr);