diff --git a/cfg/std.cfg b/cfg/std.cfg
index 5281642e0..93a13b630 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -1100,6 +1100,25 @@
       <not-uninit/>
     </arg>
   </function>
+  <!-- errno_t freopen_s(FILE *restrict *restrict newstreamptr, const char *restrict filename, const char *restrict mode, FILE *restrict stream) -->
+  <function name="freopen_s">
+    <noreturn>false</noreturn>
+    <use-retval/>
+    <arg nr="1">
+      <not-uninit/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+    <arg nr="3">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="4">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- double frexp(double x, int *exp); -->
   <!-- float frexpf(float x, int *exp); -->
   <!-- long double frexpl(long double x, int *exp); -->
diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index 3e6354d28..f4d6eff7e 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -3428,4 +3428,40 @@ HFONT CreateFont(
       <not-uninit/>
     </arg>
   </function>
+  <!-- errno_t _wfreopen_s(FILE** pFile, const wchar_t *path, const wchar_t *mode, FILE *stream); -->
+  <function name="_wfreopen_s,_tfreopen_s">
+    <noreturn>false</noreturn>
+    <use-retval/>
+    <arg nr="1">
+      <not-uninit/>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+    <arg nr="3">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="4">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+  </function>
+  <!-- FILE *_wfreopen(const wchar_t *path, const wchar_t *mode, FILE *stream);  -->
+  <function name="_wfreopen,_tfreopen">
+    <noreturn>false</noreturn>
+    <use-retval/>
+    <arg nr="1">
+      <not-uninit/>
+      <strz/>
+    </arg>
+    <arg nr="2">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="3">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+  </function>
 </def>