diff --git a/cpu/cortexm_common/reboot_arch.c b/cpu/cortexm_common/reboot_arch.c
index 16a85754d3..338f2ba38b 100644
--- a/cpu/cortexm_common/reboot_arch.c
+++ b/cpu/cortexm_common/reboot_arch.c
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2014-2015 Freie Universität Berlin
+ *               2015 Kaspar Schleiser <kaspar@schleiser.de>
  *
  * This file is subject to the terms and conditions of the GNU Lesser
  * General Public License v2.1. See the file LICENSE in the top level
@@ -14,6 +15,7 @@
  * @brief       Implementation of the kernels reboot interface
  *
  * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @author      Kaspar Schleiser <kaspar@schleiser.de>
  *
  * @}
  */
@@ -22,13 +24,13 @@
 
 #include "arch/reboot_arch.h"
 #include "cpu.h"
-#include "hwtimer.h"
 
 int reboot_arch(int mode)
 {
     printf("Going into reboot, mode %i\n", mode);
-    /* wait 1 ms to make sure the printf is finished */
-    hwtimer_wait(HWTIMER_TICKS(1000));
+    /* wait a while to make sure the printf is finished */
+    volatile int n = 100000;
+    while(n--);
     NVIC_SystemReset();
     return -1;
 }