diff --git a/lib/isc/netmgr/netmgr-int.h b/lib/isc/netmgr/netmgr-int.h
index 03f7ba3a08..1b7e881b5b 100644
--- a/lib/isc/netmgr/netmgr-int.h
+++ b/lib/isc/netmgr/netmgr-int.h
@@ -1331,12 +1331,6 @@ isc__nm_socket_reuse_lb(uv_os_sock_t fd);
  * Set the SO_REUSEPORT_LB (or equivalent) socket option on the fd
  */
 
-isc_result_t
-isc__nm_socket_incoming_cpu(uv_os_sock_t fd);
-/*%<
- * Set the SO_INCOMING_CPU socket option on the fd if available
- */
-
 isc_result_t
 isc__nm_socket_disable_pmtud(uv_os_sock_t fd, sa_family_t sa_family);
 /*%<
diff --git a/lib/isc/netmgr/socket.c b/lib/isc/netmgr/socket.c
index 2b1e0e652e..7440c0b855 100644
--- a/lib/isc/netmgr/socket.c
+++ b/lib/isc/netmgr/socket.c
@@ -218,20 +218,6 @@ isc__nm_socket_reuse_lb(uv_os_sock_t fd) {
 #endif
 }
 
-isc_result_t
-isc__nm_socket_incoming_cpu(uv_os_sock_t fd) {
-#ifdef SO_INCOMING_CPU
-	if (setsockopt_on(fd, SOL_SOCKET, SO_INCOMING_CPU) == -1) {
-		return (ISC_R_FAILURE);
-	} else {
-		return (ISC_R_SUCCESS);
-	}
-#else
-	UNUSED(fd);
-#endif
-	return (ISC_R_NOTIMPLEMENTED);
-}
-
 isc_result_t
 isc__nm_socket_disable_pmtud(uv_os_sock_t fd, sa_family_t sa_family) {
 	/*
diff --git a/lib/isc/netmgr/tcp.c b/lib/isc/netmgr/tcp.c
index c106968c26..f43b1118b0 100644
--- a/lib/isc/netmgr/tcp.c
+++ b/lib/isc/netmgr/tcp.c
@@ -285,7 +285,6 @@ isc__nm_tcp_lb_socket(isc_nm_t *mgr, sa_family_t sa_family) {
 	result = isc__nm_socket(sa_family, SOCK_STREAM, 0, &sock);
 	RUNTIME_CHECK(result == ISC_R_SUCCESS);
 
-	(void)isc__nm_socket_incoming_cpu(sock);
 	(void)isc__nm_socket_v6only(sock, sa_family);
 
 	/* FIXME: set mss */
diff --git a/lib/isc/netmgr/udp.c b/lib/isc/netmgr/udp.c
index 1bcff168b2..653ef778d3 100644
--- a/lib/isc/netmgr/udp.c
+++ b/lib/isc/netmgr/udp.c
@@ -74,7 +74,6 @@ isc__nm_udp_lb_socket(isc_nm_t *mgr, sa_family_t sa_family) {
 	result = isc__nm_socket(sa_family, SOCK_DGRAM, 0, &sock);
 	RUNTIME_CHECK(result == ISC_R_SUCCESS);
 
-	(void)isc__nm_socket_incoming_cpu(sock);
 	(void)isc__nm_socket_disable_pmtud(sock, sa_family);
 	(void)isc__nm_socket_v6only(sock, sa_family);
 
@@ -810,8 +809,6 @@ isc_nm_udpconnect(isc_nm_t *mgr, isc_sockaddr_t *local, isc_sockaddr_t *peer,
 	RUNTIME_CHECK(result == ISC_R_SUCCESS ||
 		      result == ISC_R_NOTIMPLEMENTED);
 
-	(void)isc__nm_socket_incoming_cpu(sock->fd);
-
 	(void)isc__nm_socket_disable_pmtud(sock->fd, sa_family);
 
 	(void)isc__nm_socket_min_mtu(sock->fd, sa_family);