diff --git a/lib/std/c.zig b/lib/std/c.zig
index 9d9c7c5708..1a801733bd 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -10298,7 +10298,7 @@ pub extern "c" fn setrlimit64(resource: rlimit_resource, rlim: *const rlimit) c_
 
 pub const arc4random_buf = switch (native_os) {
     .linux => if (builtin.abi.isAndroid()) private.arc4random_buf else {},
-    .dragonfly, .netbsd, .freebsd, .solaris, .openbsd, .serenity, .macos, .ios, .tvos, .watchos, .visionos => private.arc4random_buf,
+    .dragonfly, .netbsd, .freebsd, .solaris, .illumos, .openbsd, .serenity, .macos, .ios, .tvos, .watchos, .visionos => private.arc4random_buf,
     else => {},
 };
 pub const getentropy = switch (native_os) {