diff --git a/FW/Core/001-base_rt/.config b/FW/Core/001-base_rt/.config
index e12ab9c..23c245d 100644
--- a/FW/Core/001-base_rt/.config
+++ b/FW/Core/001-base_rt/.config
@@ -37,7 +37,7 @@ CONFIG_RT_TIMER_THREAD_STACK_SIZE=4096
 #
 # CONFIG_RT_KLIBC_USING_STDLIB is not set
 # CONFIG_RT_KLIBC_USING_TINY_SIZE is not set
-# CONFIG_RT_KLIBC_USING_PRINTF_LONGLONG is not set
+CONFIG_RT_KLIBC_USING_PRINTF_LONGLONG=y
 # end of klibc optimization
 
 CONFIG_RT_USING_DEBUG=y
diff --git a/FW/Core/001-base_rt/rtconfig.h b/FW/Core/001-base_rt/rtconfig.h
index cf3588b..7faeb14 100644
--- a/FW/Core/001-base_rt/rtconfig.h
+++ b/FW/Core/001-base_rt/rtconfig.h
@@ -25,6 +25,7 @@
 
 /* klibc optimization */
 
+#define RT_KLIBC_USING_PRINTF_LONGLONG
 /* end of klibc optimization */
 #define RT_USING_DEBUG
 #define RT_DEBUGING_ASSERT