diff --git a/cpu/nrf51822/include/cpu-conf.h b/cpu/nrf51822/include/cpu-conf.h
index 8a5accd9b84b307a394b4d12de978e6823ddb7b8..11a3d8216ef9ac9b9e0f6dd03f066675550537aa 100644
--- a/cpu/nrf51822/include/cpu-conf.h
+++ b/cpu/nrf51822/include/cpu-conf.h
@@ -22,17 +22,14 @@
 #include "nrf51.h"
 #include "nrf51_bitfields.h"
 
-
 /**
  * @name Kernel configuration
- *
- * TODO: measure and adjust for the cortex-m0
  * @{
  */
-#define KERNEL_CONF_STACKSIZE_PRINTF    (524)
+#define KERNEL_CONF_STACKSIZE_PRINTF    (512)
 
 #ifndef KERNEL_CONF_STACKSIZE_DEFAULT
-#define KERNEL_CONF_STACKSIZE_DEFAULT   (524)
+#define KERNEL_CONF_STACKSIZE_DEFAULT   (512)
 #endif
 
 #define KERNEL_CONF_STACKSIZE_IDLE      (256)