diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index 947ad91bc..fb5c3dc79 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -4060,4 +4060,5 @@ HFONT CreateFont(
   <define name="WINAPI" value=""/>
   <define name="__pragma(x)" value=""/>
   <define name="TEXT(str)" value="str"/>
+  <define name="_countof(_Array)" value="(sizeof(_Array) / sizeof(_Array[0]))"/>
 </def>