diff --git a/interpreters/micropython/micropython_main.c b/interpreters/micropython/micropython_main.c
index 0d68e815b..f16c954e7 100644
--- a/interpreters/micropython/micropython_main.c
+++ b/interpreters/micropython/micropython_main.c
@@ -143,12 +143,6 @@ void do_str(FAR const char *src)
  * Public Functions
  ****************************************************************************/
 
-float nanf(FAR const char *tagp)
-{
-  (void)tagp;
-  return 0;
-}
-
 /****************************************************************************
  * mp_import_stat
  ****************************************************************************/