diff --git a/cpu/samd21/include/cpu-conf.h b/cpu/samd21/include/cpu-conf.h
index bbd7eefbd0..6868d7c470 100644
--- a/cpu/samd21/include/cpu-conf.h
+++ b/cpu/samd21/include/cpu-conf.h
@@ -33,7 +33,7 @@ extern "C" {
 #define KERNEL_CONF_STACKSIZE_PRINTF    (512)
 
 #ifndef KERNEL_CONF_STACKSIZE_DEFAULT
-#define KERNEL_CONF_STACKSIZE_DEFAULT   (512)
+#define KERNEL_CONF_STACKSIZE_DEFAULT   (1024)
 #endif
 
 #define KERNEL_CONF_STACKSIZE_IDLE      (256)