diff --git a/src/time.c b/src/time.c
index a3423ed..6fe6b39 100644
--- a/src/time.c
+++ b/src/time.c
@@ -45,8 +45,8 @@ void sleepMsec(msec_t time){
     sleepNsec(time * M);
 }
 
-#define portable_localtime_s(time_t_ptr, tm_ptr) IFWIN(localtime_s(tm_ptr, time_t_ptr), localtime_s(time_t_ptr, tm_ptr))
-#define portable_gmtime_s(time_t_ptr, tm_ptr) IFWIN(gmtime_s(tm_ptr, time_t_ptr), gmtime_s(time_t_ptr, tm_ptr))
+#define portable_localtime_s(time_t_ptr, tm_ptr) IFWIN(localtime_s(tm_ptr, time_t_ptr), localtime_r(time_t_ptr, tm_ptr))
+#define portable_gmtime_s(time_t_ptr, tm_ptr) IFWIN(gmtime_s(tm_ptr, time_t_ptr), gmtime_r(time_t_ptr, tm_ptr))
 
 void DateTime_get(DateTime* dt, bool utc_time){
     time_t c_time = time(NULL);