diff --git a/sys/dev/null/null.c b/sys/dev/null/null.c
--- a/sys/dev/null/null.c
+++ b/sys/dev/null/null.c
@@ -48,6 +48,7 @@
 static struct cdev *null_dev;
 static struct cdev *zero_dev;
 
+static d_read_t  null_read;
 static d_write_t full_write;
 static d_write_t null_write;
 static d_ioctl_t null_ioctl;
@@ -64,7 +65,7 @@
 
 static struct cdevsw null_cdevsw = {
 	.d_version =	D_VERSION,
-	.d_read =	(d_read_t *)nullop,
+	.d_read =	null_read,
 	.d_write =	null_write,
 	.d_ioctl =	null_ioctl,
 	.d_name =	"null",
@@ -79,6 +80,13 @@
 	.d_flags =	D_MMAP_ANON,
 };
 
+static int
+null_read(struct cdev *dev __unused, struct uio *uio __unused,
+    int flags __unused)
+{
+	return (0);
+}
+
 /* ARGSUSED */
 static int
 full_write(struct cdev *dev __unused, struct uio *uio __unused, int flags __unused)