diff --git a/lib/std/c/netbsd.zig b/lib/std/c/netbsd.zig
index 11126e71151efa7c7ff16d0615d7363caddc9866..8204e17cfc805dd652d5d4410f0c7dc82512dd0a 100644
--- a/lib/std/c/netbsd.zig
+++ b/lib/std/c/netbsd.zig
@@ -485,6 +485,11 @@ pub const AF = struct {
     pub const MAX = 37;
 };
 
+pub const accept_filter_arg = extern struct {
+    af_name: [16]u8,
+    af_args: [240]u8,
+};
+
 pub const in_port_t = u16;
 pub const sa_family_t = u8;