diff --git a/lib/isc/netmgr/netmgr.c b/lib/isc/netmgr/netmgr.c
index 0b708b57d5..bb55bf5ab8 100644
--- a/lib/isc/netmgr/netmgr.c
+++ b/lib/isc/netmgr/netmgr.c
@@ -2985,7 +2985,7 @@ isc__nm_closesocket(uv_os_sock_t sock) {
 	setsockopt(socket, level, name, &(int){ 1 }, sizeof(int))
 
 #define setsockopt_off(socket, level, name) \
-	setsockopt(socket, level, name, &(int){ 1 }, sizeof(int))
+	setsockopt(socket, level, name, &(int){ 0 }, sizeof(int))
 
 isc_result_t
 isc__nm_socket_freebind(uv_os_sock_t fd, sa_family_t sa_family) {