diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index 61692d0c3..df4cdcb6c 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -169,6 +169,14 @@
       <not-uninit/>
     </arg>
   </function>
+  <function name="readdir">
+    <noreturn>false</noreturn>
+    <arg nr="1">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <leak-ignore/>
+  </function>
   <function name="rand_r">
     <noreturn>false</noreturn>
     <leak-ignore/>
diff --git a/test/testnullpointer.cpp b/test/testnullpointer.cpp
index fc5a089c8..d9e156314 100644
--- a/test/testnullpointer.cpp
+++ b/test/testnullpointer.cpp
@@ -2665,6 +2665,9 @@ private:
               "  strdup(x);\n"
               "}");
         ASSERT_EQUALS("[test.cpp:4]: (error) Possible null pointer dereference: x\n", errout.str());
+
+        check("DIR* f(){ DIR *dirp = 0; return readdir (dirp);}");
+        ASSERT_EQUALS("[test.cpp:1]: (error) Possible null pointer dereference: dirp\n",errout.str());
     }
 };