diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index 2ee5ed57c..df3ed7878 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -1341,6 +1341,25 @@ The function 'mktemp' is considered to be dangerous due to race conditions and s
       <valid>0:</valid>
     </arg>
   </function>
+  <!-- ssize_t sendfile(int out_fd, int in_fd, off_t *offset, size_t count); -->
+  <function name="sendfile">
+    <leak-ignore/>
+    <returnValue type="ssize_t"/>
+    <arg nr="1" direction="in">
+      <not-uninit/>
+      <valid>0:</valid>
+    </arg>
+    <arg nr="2" direction="in">
+      <not-uninit/>
+      <valid>0:</valid>
+    </arg>
+    <arg nr="3" direction="in">
+      <not-uninit/>
+    </arg>
+    <arg nr="4" direction="in">
+      <valid>1:</valid>
+    </arg>
+  </function>
   <!-- ssize_t read(int fd, void *buf, size_t count); -->
   <function name="read">
     <leak-ignore/>