diff --git a/core/hwtimer.c b/core/hwtimer.c
index de182fa2e696fcc587e2ca247b4a12c70cf20882..4abbca38acc2483a94d042046c9971f2d4d93cc6 100644
--- a/core/hwtimer.c
+++ b/core/hwtimer.c
@@ -18,15 +18,16 @@
  */
 
 #include <stdio.h>
-#include <hwtimer.h>
-#include <hwtimer_cpu.h>
-#include <hwtimer_arch.h>
 
-#include <kernel.h>
-#include <thread.h>
-#include <lifo.h>
+#include "kernel.h"
+#include "thread.h"
+#include "lifo.h"
 #include "mutex.h"
 
+#include "hwtimer.h"
+#include "hwtimer_cpu.h"
+#include "hwtimer_arch.h"
+
 /*---------------------------------------------------------------------------*/
 
 typedef struct hwtimer_t {