diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index b1e32e5c988..26448004810 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -1411,6 +1411,53 @@
     </arg>
     <warn severity="style" reason="Obsolete" alternatives="RtlFillMemory"/>
   </function>
+  <!-- unsigned int _get_output_format(); -->
+  <function name="_get_output_format">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <use-retval/>
+    <returnValue type="unsigned int"/>
+    <warn severity="style" reason="Obsolete" alternatives="No_alternatives_available"/>
+  </function>
+  <!-- int _heapadd(void *memblock, size_t size); -->
+  <function name="_heapadd">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <returnValue type="int"/>
+    <arg nr="1" direction="inout">
+      <not-null/>
+    </arg>
+    <arg nr="2" direction="in">
+      <not-uninit/>
+      <not-bool/>
+    </arg>
+    <warn severity="style" reason="Obsolete" alternatives="No_alternatives_available"/>
+  </function>
+  <!-- char *_cgets(char *buffer); -->
+  <!-- template <size_t size> char *_cgets(char (&buffer)[size]); // C++ only -->
+  <function name="_cgets">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <use-retval/>
+    <returnValue type="char *"/>
+    <arg nr="1" direction="out">
+      <not-null/>
+    </arg>
+    <warn severity="style" reason="Obsolete" alternatives="_cgets_s"/>
+  </function>
+  <!-- wchar_t *_cgetws(wchar_t *buffer); -->
+  <!-- wchar_t *_getws(wchar_t *buffer); -->
+  <!-- template <size_t size> wchar_t *_cgetws(wchar_t (&buffer)[size]); // C++ only -->
+  <function name="_cgetws,_getws">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <use-retval/>
+    <returnValue type="wchar_t *"/>
+    <arg nr="1" direction="out">
+      <not-null/>
+    </arg>
+    <warn severity="style" reason="Obsolete" alternatives="_cgetws_s,_getws_s"/>
+  </function>
   <!-- int _iswctype( wint_t wc, wctype_t desc ); -->
   <!-- int is_wctype( wint_t wc, wctype_t desc ); -->
   <function name="_iswctype,is_wctype">