diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index c6128b57b..9fdb3dc48 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -2985,4 +2985,39 @@ HFONT CreateFont(
       <not-uninit/>
     </arg>
   </function>
+  <!-- unsigned char *_mbsstr(const unsigned char *str, const unsigned char *strSearch  -->
+  <function name="_mbsstr,_tcsstr">
+    <use-retval/>
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1">
+      <not-null/>
+      <not-uninit/>
+      <strz/>
+    </arg>
+    <arg nr="2">
+      <not-null/>
+      <not-uninit/>
+      <strz/>
+    </arg>
+  </function>
+  <!-- unsigned char *_mbsstr_l(const unsigned char *str, const unsigned char *strSearch, _locale_t locale )-->
+  <function name="_mbsstr_l">
+    <use-retval/>
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1">
+      <not-null/>
+      <not-uninit/>
+      <strz/>
+    </arg>
+    <arg nr="2">
+      <not-null/>
+      <not-uninit/>
+      <strz/>
+    </arg>
+    <arg nr="3">
+      <not-uninit/>
+    </arg>
+  </function>
 </def>