Index: src/threading.m
==================================================================
--- src/threading.m
+++ src/threading.m
@@ -24,14 +24,10 @@
 # include "threading_winapi.m"
 #else
 # error No threads available!
 #endif
 
-#ifdef OF_HAIKU
-# include <kernel/OS.h>
-#endif
-
 bool
 of_rmutex_new(of_rmutex_t *rmutex)
 {
 #if defined(OF_HAVE_RECURSIVE_PTHREAD_MUTEXES)
 	pthread_mutexattr_t attr;

Index: src/threading_pthread.m
==================================================================
--- src/threading_pthread.m
+++ src/threading_pthread.m
@@ -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;
 };