diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index 9fe884e43..f752e381c 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -6167,6 +6167,51 @@ HFONT CreateFont(
       <not-uninit/>
     </arg>
   </function>
+  <!-- unsigned char *_mbsncat_l(unsigned char *strDest, const unsigned char *strSource, size_t count, _locale_t locale); -->
+  <function name="_mbsncat_l">
+    <noreturn>false</noreturn>
+    <returnValue type="unsigned char *"/>
+    <leak-ignore/>
+    <not-overlapping-data ptr1-arg="1" ptr2-arg="2" size-arg="3"/>
+    <arg nr="1" direction="inout">
+      <not-null/>
+      <not-uninit/>
+      <strz/>
+      <minsize type="argvalue" arg="3"/>
+    </arg>
+    <arg nr="2" direction="in">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="3" direction="in">
+      <not-uninit/>
+      <not-bool/>
+      <valid>0:</valid>
+    </arg>
+    <arg nr="4" direction="in"/>
+  </function>
+  <!-- unsigned char *_mbsncat(unsigned char *strDest, const unsigned char *strSource, size_t count); -->
+  <function name="_mbsncat">
+    <noreturn>false</noreturn>
+    <returnValue type="unsigned char *"/>
+    <leak-ignore/>
+    <not-overlapping-data ptr1-arg="1" ptr2-arg="2" size-arg="3"/>
+    <arg nr="1" direction="inout">
+      <not-null/>
+      <not-uninit/>
+      <strz/>
+      <minsize type="argvalue" arg="3"/>
+    </arg>
+    <arg nr="2" direction="in">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="3" direction="in">
+      <not-uninit/>
+      <not-bool/>
+      <valid>0:</valid>
+    </arg>
+  </function>
   <!-- unsigned char *_mbscat(unsigned char *strDestination, const unsigned char *strSource); -->
   <!-- template <size_t size> unsigned char *_mbscat(unsigned char (&strDestination)[size], const unsigned char *strSource); // C++ only -->
   <function name="_mbscat">