diff --git a/lib/sockopt.c b/lib/sockopt.c
index 5936d66..c448d30 100644
--- a/lib/sockopt.c
+++ b/lib/sockopt.c
@@ -46,6 +46,8 @@
        cmsg = CMSG_NXTHDR(msgh, cmsg))
     if (cmsg->cmsg_level == level && cmsg->cmsg_type)
       return (ptr = CMSG_DATA(cmsg));
+
+  return NULL;
 }
 
 #ifdef HAVE_IPV6