diff --git a/sys/cddl/dev/prototype.c b/sys/cddl/dev/prototype.c
--- a/sys/cddl/dev/prototype.c
+++ b/sys/cddl/dev/prototype.c
@@ -15,7 +15,6 @@
 
 #include <sys/dtrace.h>
 
-static d_open_t	prototype_open;
 static int	prototype_unload(void);
 static void	prototype_getargdesc(void *, dtrace_id_t, void *, dtrace_argdesc_t *);
 static void	prototype_provide(void *, dtrace_probedesc_t *);
@@ -24,12 +23,6 @@
 static void	prototype_disable(void *, dtrace_id_t, void *);
 static void	prototype_load(void *);
 
-static struct cdevsw prototype_cdevsw = {
-	.d_version	= D_VERSION,
-	.d_open		= prototype_open,
-	.d_name		= "prototype",
-};
-
 static dtrace_pattr_t prototype_attr = {
 { DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_COMMON },
 { DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
@@ -51,7 +44,6 @@
 	.dtps_destroy =		prototype_destroy
 };
 
-static struct cdev		*prototype_cdev;
 static dtrace_provider_id_t	prototype_id;
 
 static void
@@ -82,10 +74,6 @@
 static void
 prototype_load(void *dummy)
 {
-	/* Create the /dev/dtrace/prototype entry. */
-	prototype_cdev = make_dev(&prototype_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
-	    "dtrace/prototype");
-
 	if (dtrace_register("prototype", &prototype_attr, DTRACE_PRIV_USER,
 	    NULL, &prototype_pops, NULL, &prototype_id) != 0)
 		return;
@@ -100,8 +88,6 @@
 	if ((error = dtrace_unregister(prototype_id)) != 0)
 		return (error);
 
-	destroy_dev(prototype_cdev);
-
 	return (error);
 }
 
@@ -129,12 +115,6 @@
 	return (error);
 }
 
-static int
-prototype_open(struct cdev *dev __unused, int oflags __unused, int devtype __unused, struct thread *td __unused)
-{
-	return (0);
-}
-
 SYSINIT(prototype_load, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, prototype_load, NULL);
 SYSUNINIT(prototype_unload, SI_SUB_DTRACE_PROVIDER, SI_ORDER_ANY, prototype_unload, NULL);