+diff --git a/noip.c b/noip.c
+index aca7b75..072d2fc 100644
+--- a/noip.c
++++ b/noip.c
+@@ -149,7 +152,7 @@ static impbind *impbinds, **impbind_tail = &impbinds;
+ struct sockaddr *from, socklen_t *fromlen)) \
+ _(sendmsg, ssize_t, (int, const struct msghdr *, int)) \
+ _(recvmsg, ssize_t, (int, struct msghdr *, int)) \
+- _(ioctl, int, (int, unsigned long, ...))
++ _(ioctl, int, (int, int, ...))
+
+ /* Function pointers to set up. */
+ #define DECL(imp, ret, args) static ret (*real_##imp) args;
+@@ -2000,7 +2003,7 @@ int setsockopt(int sk, int lev, int opt, const void *p, socklen_t len)
+ return (real_setsockopt(sk, lev, opt, p, len));
+ }
+
+-int ioctl(int fd, unsigned long op, ...)
++int ioctl(int fd, int op, ...)
+ {
+ va_list ap;
+ void *arg;