@@ -19,10 +19,14 @@
 #ifdef HAVE_PTHREAD_NP_H
 # include <pthread_np.h>
 #endif
 
 #import "macros.h"
+
+#ifdef OF_HAIKU
+# include <kernel/OS.h>
+#endif
 
 struct thread_ctx {
 	void (*function)(id object);
 	id object;
 };