diff --git a/RosBE-Windows/Tools/buildtime.c b/RosBE-Windows/Tools/buildtime.c
index f18ddab..d7b0d9c 100644
--- a/RosBE-Windows/Tools/buildtime.c
+++ b/RosBE-Windows/Tools/buildtime.c
@@ -8,6 +8,7 @@
  */
 
 
+#include <windows.h>
 #include <time.h>
 #include <stdio.h>
 #include <stdlib.h>