diff --git a/components/libc/newlib/syscalls.c b/components/libc/newlib/syscalls.c
index 7d3797948ce74ed76281d89383fee5c132057288..5b829f47532f30378250ff665b8baf80c81e590a 100644
--- a/components/libc/newlib/syscalls.c
+++ b/components/libc/newlib/syscalls.c
@@ -82,7 +82,7 @@ _link_r(struct _reent *ptr, const char *old, const char *new)
 _off_t
 _lseek_r(struct _reent *ptr, int fd, _off_t pos, int whence)
 {
-#ifndef RT_USING_DfS
+#ifndef RT_USING_DFS
 	return 0;
 #else
 	_off_t rc;