diff --git a/cpu/lpc2387/include/cpu-conf.h b/cpu/lpc2387/include/cpu-conf.h
index afe924cf37..c18eac3027 100644
--- a/cpu/lpc2387/include/cpu-conf.h
+++ b/cpu/lpc2387/include/cpu-conf.h
@@ -53,7 +53,8 @@ See the file LICENSE in the top level directory for more details.
  * @name Kernel configuration
  * @{
  */
-#define KERNEL_CONF_STACKSIZE_PRINTF    (4096)
+#define KERNEL_CONF_STACKSIZE_PRINTF_FLOAT  (4096)
+#define KERNEL_CONF_STACKSIZE_PRINTF        (2048)
 
 #ifndef KERNEL_CONF_STACKSIZE_DEFAULT
 #define KERNEL_CONF_STACKSIZE_DEFAULT	(512)
diff --git a/cpu/mc1322x/include/cpu-conf.h b/cpu/mc1322x/include/cpu-conf.h
index 57121f114e..60ee83aae1 100644
--- a/cpu/mc1322x/include/cpu-conf.h
+++ b/cpu/mc1322x/include/cpu-conf.h
@@ -37,13 +37,14 @@
  * @name Kernel configuration
  * @{
  */
-#define KERNEL_CONF_STACKSIZE_PRINTF    (4096)
+#define KERNEL_CONF_STACKSIZE_PRINTF_FLOAT  (4096)
+#define KERNEL_CONF_STACKSIZE_PRINTF        (2048)
 
 #ifndef KERNEL_CONF_STACKSIZE_DEFAULT
 #define KERNEL_CONF_STACKSIZE_DEFAULT	(512)
 #endif
 
-#define KERNEL_CONF_STACKSIZE_IDLE		500
+#define KERNEL_CONF_STACKSIZE_IDLE	(160)
 /** @} */
 
 /**
diff --git a/cpu/msp430-common/include/cpu-conf.h b/cpu/msp430-common/include/cpu-conf.h
index 4ffa783b63..64de02e7f2 100644
--- a/cpu/msp430-common/include/cpu-conf.h
+++ b/cpu/msp430-common/include/cpu-conf.h
@@ -18,6 +18,7 @@ See the file LICENSE in the top level directory for more details.
  * @{
  */
 #define KERNEL_CONF_STACKSIZE_PRINTF    (256)
+#define KERNEL_CONF_STACKSIZE_PRINTF_FLOAT (KERNEL_CONF_STACKSIZE_PRINTF)
 
 #ifndef KERNEL_CONF_STACKSIZE_DEFAULT
 #define KERNEL_CONF_STACKSIZE_DEFAULT	(256)
diff --git a/cpu/native/include/cpu-conf.h b/cpu/native/include/cpu-conf.h
index edec5b5770..9e0122349b 100644
--- a/cpu/native/include/cpu-conf.h
+++ b/cpu/native/include/cpu-conf.h
@@ -18,9 +18,10 @@
 
 /* TODO: tighten stack sizes */
 #ifdef __MACH__ /* OSX */
-#define KERNEL_CONF_STACKSIZE_DEFAULT   (163840)
-#define KERNEL_CONF_STACKSIZE_IDLE      (163840)
-#define KERNEL_CONF_STACKSIZE_PRINTF    (163840)
+#define KERNEL_CONF_STACKSIZE_DEFAULT       (163840)
+#define KERNEL_CONF_STACKSIZE_IDLE          (163840)
+#define KERNEL_CONF_STACKSIZE_PRINTF        (163840)
+#define KERNEL_CONF_STACKSIZE_PRINTF_FLOAT  (163840)
 /* for core/include/thread.h */
 #define MINIMUM_STACK_SIZE              (163840)
 /* undefine the TRANSCEIVER_STACK_SIZE (2048 or 512) defined in transceiver.h */
@@ -33,9 +34,10 @@
 #define NATIVE_ISR_STACKSIZE            (163840)
 
 #else /* Linux etc. */
-#define KERNEL_CONF_STACKSIZE_DEFAULT	(8192)
-#define KERNEL_CONF_STACKSIZE_IDLE      (8192)
-#define KERNEL_CONF_STACKSIZE_PRINTF    (8192)
+#define KERNEL_CONF_STACKSIZE_DEFAULT       (8192)
+#define KERNEL_CONF_STACKSIZE_IDLE          (8192)
+#define KERNEL_CONF_STACKSIZE_PRINTF        (8192)
+#define KERNEL_CONF_STACKSIZE_PRINTF_FLOAT  (8192)
 /* for core/include/thread.h */
 #define MINIMUM_STACK_SIZE              (8192)
 /* undefine the TRANSCEIVER_STACK_SIZE (2048 or 512) defined in transceiver.h */