diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index c3a062935..075fbab13 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -4014,6 +4014,18 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
       <not-bool/>
     </arg>
   </function>
+  <!-- long telldir(DIR *dirp); -->
+  <function name="telldir">
+    <returnValue type="long"/>
+    <use-retval/>
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1" direction="inout">
+      <not-null/>
+      <not-uninit/>
+      <not-bool/>
+    </arg>
+  </function>
   <!-- http://man7.org/linux/man-pages/man3/fileno.3p.html -->
   <!-- int fileno(FILE *stream); -->
   <function name="fileno">