diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index 10a07162c..c68cae645 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -5221,6 +5221,29 @@ HFONT CreateFont(
       <not-uninit/>
     </arg>
   </function>
+  <function name="umask">
+    <returnValue type="int"/>
+	<arg nr="1">
+      <not-uninit/>
+    </arg>
+	<warn severity="style" alternatives="_umask" reason="Obsolete"/>
+  </function>
+  <function name="_umask">
+    <returnValue type="int"/>
+	<arg nr="1">
+      <not-uninit/>
+    </arg>
+  </function>
+  <function name="_umask_s">
+    <returnValue type="errno_t"/>
+	<arg nr="1">
+	<not-bool/>
+      <not-uninit/>
+    </arg>
+	<arg nr="1">
+      <not-null/>
+    </arg>
+  </function>
   <!-- HLOCAL WINAPI LocalAlloc(
   _In_ UINT   uFlags,
   _In_ SIZE_T uBytes); -->