diff --git a/lib/std/c.zig b/lib/std/c.zig
index bcfbccccd44f9ed131c91ad36e1cf7e5d60de4a2..b4e29e664b4fd0ba8c04df55677c97d9470378fb 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -11069,6 +11069,10 @@ pub const pthread_cancelstate = switch (native_os) {
         ENABLE = 0,
         DISABLE = 1,
     },
+    .serenity => enum(c_int) {
+        ENABLE = 1,
+        DISABLE = 2,
+    },
     else => void,
 };
 pub extern "c" fn pthread_setcancelstate(pthread_cancelstate, ?*pthread_cancelstate) E;