diff --git a/lib/std/c.zig b/lib/std/c.zig
index f1176e48742daa66d2459052f108fe1dc135e6c1..11810f4effa1f72ad4ca269d72f28ea3582013a1 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -8223,7 +8223,7 @@ pub const pthread_key_t = switch (native_os) {
     .linux, .emscripten => c_uint,
     .driverkit, .ios, .maccatalyst, .macos, .tvos, .visionos, .watchos => c_ulong,
     // https://github.com/SerenityOS/serenity/blob/b98f537f117b341788023ab82e0c11ca9ae29a57/Kernel/API/POSIX/sys/types.h#L65
-    .openbsd, .haiku, .illumos, .serenity => c_int,
+    .dragonfly, .openbsd, .haiku, .illumos, .serenity => c_int,
     else => void,
 };