diff --git a/lib/std/c.zig b/lib/std/c.zig
index 11810f4effa1f72ad4ca269d72f28ea3582013a1..29d7f39ddd4cea701dc38f24d879027bdc2230a0 100644
--- a/lib/std/c.zig
+++ b/lib/std/c.zig
@@ -11091,7 +11091,7 @@ pub const pthread_cancelstate = switch (native_os) {
         ENABLE = 1,
         DISABLE = 0,
     },
-    .haiku => enum(c_int) {
+    .dragonfly, .haiku => enum(c_int) {
         ENABLE = 0,
         DISABLE = 1,
     },