diff --git a/cpu/lpc2387/include/cpu-conf.h b/cpu/lpc2387/include/cpu-conf.h
index 6071fcf658..9ae31d4658 100644
--- a/cpu/lpc2387/include/cpu-conf.h
+++ b/cpu/lpc2387/include/cpu-conf.h
@@ -59,7 +59,7 @@ License. See the file LICENSE in the top level directory for more details.
 #define KERNEL_CONF_STACKSIZE_DEFAULT	(512)
 #endif
 
-#define KERNEL_CONF_STACKSIZE_IDLE		(512)
+#define KERNEL_CONF_STACKSIZE_IDLE		(160)
 /** @} */
 
 /**