diff --git a/sys/kern/uipc_socket.c b/sys/kern/uipc_socket.c
--- a/sys/kern/uipc_socket.c
+++ b/sys/kern/uipc_socket.c
@@ -971,7 +971,9 @@
 	so->so_options |= SO_ACCEPTCONN;
 
 listening:
-	if (backlog < 0 || backlog > somaxconn)
+	if (backlog < 0)
+		backlog = 0;
+	if (backlog > somaxconn)
 		backlog = somaxconn;
 	so->sol_qlimit = backlog;
 }