diff --git a/cfg/std.cfg b/cfg/std.cfg
index 5bb281d6e..762c75dff 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -6068,12 +6068,14 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
   </function>
   <!--std::streamsize std::ios_base::precision(streamsize prec)-->
   <!--std::streamsize std::ostringstream::precision(streamsize prec)-->
-  <function name="std::ios_base::precision,std::ostringstream::precision">
+  <!--std::streamsize std::ostream::precision(streamsize prec)-->
+  <function name="std::ios_base::precision,std::ostringstream::precision,std::ostream::precision">
     <noreturn>false</noreturn>
     <returnValue type="std::streamsize"/>
     <leak-ignore/>
     <arg nr="1" direction="in">
       <not-uninit/>
+      <valid>0:</valid>
     </arg>
   </function>
   <!--void std::ios_base::unsetf (fmtflags mask);-->