diff --git a/cpu/cortex-m0_common/reboot_arch.c b/cpu/cortex-m0_common/reboot_arch.c
index 8702ed9250..4774572398 100644
--- a/cpu/cortex-m0_common/reboot_arch.c
+++ b/cpu/cortex-m0_common/reboot_arch.c
@@ -22,13 +22,13 @@
 
 #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));
     NVIC_SystemReset();
-
     return -1;
 }
diff --git a/cpu/cortex-m3_common/reboot_arch.c b/cpu/cortex-m3_common/reboot_arch.c
index d4456efaa4..fc6046c855 100644
--- a/cpu/cortex-m3_common/reboot_arch.c
+++ b/cpu/cortex-m3_common/reboot_arch.c
@@ -22,13 +22,13 @@
 
 #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));
     NVIC_SystemReset();
-
     return -1;
 }
diff --git a/cpu/cortex-m4_common/reboot_arch.c b/cpu/cortex-m4_common/reboot_arch.c
index 6e8efdbd30..174a6a5cce 100644
--- a/cpu/cortex-m4_common/reboot_arch.c
+++ b/cpu/cortex-m4_common/reboot_arch.c
@@ -22,13 +22,13 @@
 
 #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));
     NVIC_SystemReset();
-
     return -1;
 }