diff --git a/cfg/gnu.cfg b/cfg/gnu.cfg
index 79fd5f441..f77433d0f 100644
--- a/cfg/gnu.cfg
+++ b/cfg/gnu.cfg
@@ -24,6 +24,33 @@
     </arg>
     <leak-ignore/>
   </function>
+  <!-- int getopt_long(int argc, char * const argv[],
+           const char *optstring,
+           const struct option *longopts, int *longindex);
+-->
+  <function name="getopt_long,getopt_long_only">
+    <leak-ignore/>
+    <noreturn>false</noreturn>
+    <returnValue type="int"/>
+    <use-retval/>
+    <arg nr="1">
+      <not-bool/>
+      <not-uninit/>
+      <valid>0:</valid>
+    </arg>
+    <arg nr="2">
+      <not-uninit/>
+      <not-null/>
+    </arg>
+    <arg nr="3">
+      <not-null/>
+      <strz/>
+    </arg>
+    <arg nr="4">
+      <not-null/>
+    </arg>
+    <arg nr="5"/>
+  </function>
   <!-- void *__builtin_memset(void *s, int c, size_t n); -->
   <define name="__builtin_memset" value="memset"/>
   <!-- long long atoq(const char *nptr); -->