diff --git a/cfg/std.cfg b/cfg/std.cfg
index 6f555c691..97dd981c3 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -952,6 +952,7 @@
                 const char *restrict mode); -->
   <function name="fopen_s">
     <noreturn>false</noreturn>
+    <use-retval/>
     <arg nr="1">
       <not-null/>
     </arg>