diff --git a/lib/std/c.zig b/lib/std/c.zig
index a1bca68976..c2c51ea7b8 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -150,8 +150,8 @@ pub extern "c" fn socketpair(domain: c_uint, sock_type: c_uint, protocol: c_uint
 pub extern "c" fn listen(sockfd: fd_t, backlog: c_uint) c_int;
 pub extern "c" fn getsockname(sockfd: fd_t, noalias addr: *sockaddr, noalias addrlen: *socklen_t) c_int;
 pub extern "c" fn connect(sockfd: fd_t, sock_addr: *const sockaddr, addrlen: socklen_t) c_int;
-pub extern "c" fn accept(sockfd: fd_t, addr: *sockaddr, addrlen: *socklen_t) c_int;
-pub extern "c" fn accept4(sockfd: fd_t, addr: *sockaddr, addrlen: *socklen_t, flags: c_uint) c_int;
+pub extern "c" fn accept(sockfd: fd_t, addr: ?*sockaddr, addrlen: ?*socklen_t) c_int;
+pub extern "c" fn accept4(sockfd: fd_t, addr: ?*sockaddr, addrlen: ?*socklen_t, flags: c_uint) c_int;
 pub extern "c" fn getsockopt(sockfd: fd_t, level: u32, optname: u32, optval: ?*c_void, optlen: *socklen_t) c_int;
 pub extern "c" fn setsockopt(sockfd: fd_t, level: u32, optname: u32, optval: ?*const c_void, optlen: socklen_t) c_int;
 pub extern "c" fn send(sockfd: fd_t, buf: *const c_void, len: usize, flags: u32) isize;