diff --git a/lib/std/c.zig b/lib/std/c.zig
index 857d2296a910a3d4be22146fc91a5c2de5ab5fe8..c6af875df2cc3a251cf1d9de35544a268729f0fa 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -1330,8 +1330,16 @@ pub const IOV_MAX = switch (native_os) {
 };
 pub const CTL = switch (native_os) {
     .freebsd => struct {
+        pub const SYSCTL = 0;
         pub const KERN = 1;
+        pub const VM = 2;
+        pub const VFS = 3;
+        pub const NET = 4;
         pub const DEBUG = 5;
+        pub const HW = 6;
+        pub const MACHDEP = 7;
+        pub const USER = 8;
+        pub const P1003_1B = 9;
     },
     .netbsd => struct {
         pub const KERN = 1;