diff --git a/components/libc/compilers/common/sys/time.h b/components/libc/compilers/common/sys/time.h
index b3adaedfab..2a40b7b805 100644
--- a/components/libc/compilers/common/sys/time.h
+++ b/components/libc/compilers/common/sys/time.h
@@ -57,10 +57,6 @@ time_t timegm(struct tm * const t);
 int gettimeofday(struct timeval *tv, struct timezone *tz);
 int settimeofday(const struct timeval *tv, const struct timezone *tz);
 
-#if defined(__ARMCC_VERSION) || defined (__ICCARM__)
-struct tm *gmtime_r(const time_t *timep, struct tm *r);
-#endif
-
 #ifdef RT_USING_POSIX
 #include <sys/types.h>
 /* posix clock and timer */