diff --git a/reactos/lib/sdk/crt/time_new/mktime.c b/reactos/lib/sdk/crt/time_new/mktime.c
index f5731e30bc9..7c0cf720a3f 100644
--- a/reactos/lib/sdk/crt/time_new/mktime.c
+++ b/reactos/lib/sdk/crt/time_new/mktime.c
@@ -76,7 +76,7 @@ mktime_worker(struct tm * ptm, int utc)
     }
 
     /* Finally get normalized tm struct */
-    ptm2 = gmtime(&time);
+    ptm2 = _gmtime64(&time);
     if (!ptm2)
     {
         return -1;