diff --git a/libs/libc/stdio/Make.defs b/libs/libc/stdio/Make.defs
index 5c0ead76ec3..c868e30f5fe 100644
--- a/libs/libc/stdio/Make.defs
+++ b/libs/libc/stdio/Make.defs
@@ -47,9 +47,9 @@ CSRCS += lib_libsnoflush.c
 
 ifeq ($(CONFIG_LIBC_PRINT_LEGACY),y)
 
-CSRCS += lib_libvsprintf.c
+CSRCS += legacy_libvsprintf.c
 ifeq ($(CONFIG_LIBC_FLOATINGPOINT),y)
-CSRCS += lib_dtoa.c
+CSRCS += legacy_dtoa.c
 endif
 
 #else
diff --git a/libs/libc/stdio/lib_dtoa.c b/libs/libc/stdio/legacy_dtoa.c
similarity index 99%
rename from libs/libc/stdio/lib_dtoa.c
rename to libs/libc/stdio/legacy_dtoa.c
index 75814ccab20..3cb0e20ebeb 100644
--- a/libs/libc/stdio/lib_dtoa.c
+++ b/libs/libc/stdio/legacy_dtoa.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * libs/libc/stdio/lib_dtoa.c
+ * libs/libc/stdio/legacy_dtoa.c
  *
  * This file was ported to NuttX by Yolande Cates.
  *
diff --git a/libs/libc/stdio/lib_libvsprintf.c b/libs/libc/stdio/legacy_libvsprintf.c
similarity index 99%
rename from libs/libc/stdio/lib_libvsprintf.c
rename to libs/libc/stdio/legacy_libvsprintf.c
index 9a8ccb25779..089a5258028 100644
--- a/libs/libc/stdio/lib_libvsprintf.c
+++ b/libs/libc/stdio/legacy_libvsprintf.c
@@ -1,5 +1,5 @@
 /****************************************************************************
- * libs/libc/stdio/lib_libvsprintf.c
+ * libs/libc/stdio/legacy_libvsprintf.c
  *
  *   Copyright (C) 2007-2012, 2018-2019 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>