diff --git a/ndhc/nl.h b/ndhc/nl.h
index 21f47a2..6e54709 100644
--- a/ndhc/nl.h
+++ b/ndhc/nl.h
@@ -35,7 +35,7 @@
 
 static inline int nlmsg_get_error(const struct nlmsghdr *nlh)
 {
-    const struct nlmsgerr *err = NLMSG_DATA(nlh);
+    const struct nlmsgerr *err = (const struct nlmsgerr *)NLMSG_DATA(nlh);
     if (nlh->nlmsg_len < sizeof(struct nlmsgerr) + NLMSG_HDRLEN)
         return EBADMSG;
     return err->error & 0x7fffffff;