diff --git a/cfg/std.cfg b/cfg/std.cfg
index f5c32f43e..5726465ee 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -609,6 +609,18 @@
       <not-uninit/>
     </arg>
   </function>
+  <function name="mbsinit">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1">
+      <not-uninit/>
+    </arg>
+  </function>
+  <function name="getwchar">
+    <use-retval/>
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+  </function>
   <function name="mbstowcs">
     <noreturn>false</noreturn>
     <leak-ignore/>
@@ -1873,6 +1885,19 @@
       <not-uninit/>
     </arg>
   </function>
+  <function name="mbrtowc">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="2">
+      <not-uninit/>
+    </arg>
+    <arg nr="3">
+      <not-uninit/>
+    </arg>
+    <arg nr="4">
+      <not-uninit/>
+    </arg>
+  </function>
   <function name="wcstold">
     <use-retval/>
     <noreturn>false</noreturn>