diff --git a/lib/libc/net/res_send.c b/lib/libc/net/res_send.c
index fc394ca54185..15f2a13b8ffa 100644
--- a/lib/libc/net/res_send.c
+++ b/lib/libc/net/res_send.c
@@ -665,7 +665,8 @@ read_len:
 				pfd.fd = s;
 				pfd.events = POLLIN;
 				if (use_poll == 1) {
-					bzero(&sa, sizeof(sa));
+					sigemptyset(&sa.sa_mask);
+					sa.sa_flags = 0;
 					sa.sa_handler = SIG_IGN;
 					if (sigaction(SIGSYS, &sa, &osa) >= 0)
 						sigsys_installed = 1;