diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index 843b9342c..72ee73208 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -1203,6 +1203,12 @@
     <dealloc>ExFreePool</dealloc>
     <dealloc>ExFreePoolWithTag</dealloc>
   </memory>
+  <memory>
+    <alloc init="false" arg="1">_dupenv_s</alloc>
+    <alloc init="false" arg="1">_wdupenv_s</alloc>
+    <alloc init="false" arg="1">_tdupenv_s</alloc>
+    <dealloc>free</dealloc>
+  </memory>
   <memory>
     <alloc buffer-size="malloc:3">HeapAlloc</alloc>
     <alloc>HeapReAlloc</alloc>
@@ -1624,6 +1630,23 @@
     </arg>
     <arg nr="4"/>
   </function>
+  <!-- errno_t _dupenv_s(char **buffer, size_t *numberOfElements, const char *varname);
+       errno_t _wdupenv_s(wchar_t **buffer, size_t *numberOfElements, const wchar_t *varname); -->
+  <function name="_dupenv_s,_wdupenv_s,_tdupenv_s">
+    <noreturn>false</noreturn>
+    <returnValue type="errno_t"/>
+    <arg nr="1" direction="out">
+      <not-null/>
+      <minsize type="argvalue" arg="2"/>
+    </arg>
+    <arg nr="2" direction="out">
+      <not-null/>
+    </arg>
+    <arg nr="3" direction="in">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- ULONG vDbgPrintExWithPrefix(PCCH Prefix, ULONG ComponentId, ULONG Level, PCCH Format, va_list arglist); -->
   <function name="vDbgPrintExWithPrefix">
     <noreturn>false</noreturn>