diff --git a/lib/libc/gmtime_r.c b/lib/libc/gmtime_r.c
index 700cba52d0..f378ea52b5 100644
--- a/lib/libc/gmtime_r.c
+++ b/lib/libc/gmtime_r.c
@@ -29,6 +29,10 @@
 
 #if HAVE_PTHREAD_MUTEX_INIT
 #include <pthread.h>
+#ifdef gmtime_r
+#undef gmtime_r
+#endif
+
 struct tm *
 gmtime_r(const time_t *const timep, struct tm *p_tm)
 {