diff --git a/bsp/stm32f7-disco/rtconfig.h b/bsp/stm32f7-disco/rtconfig.h
index 8abaf2992..64bd44367 100644
--- a/bsp/stm32f7-disco/rtconfig.h
+++ b/bsp/stm32f7-disco/rtconfig.h
@@ -114,7 +114,7 @@
 
 // <section name="LIBC" description="C Runtime library setting" default="always" >
 // <bool name="RT_USING_LIBC" description="Using libc library" default="true" />
-#define RT_USING_NEWLIB
+#define RT_USING_LIBC
 // <bool name="RT_USING_PTHREADS" description="Using POSIX threads library" default="true" />
 //#define RT_USING_PTHREADS
 // </section>