diff --git a/lib/isc/event.c b/lib/isc/event.c
index 4849d0162f..547c839bb9 100644
--- a/lib/isc/event.c
+++ b/lib/isc/event.c
@@ -46,37 +46,6 @@ isc_event_allocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type,
 	return (event);
 }
 
-isc_event_t *
-isc_event_constallocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type,
-			isc_taskaction_t action, const void *arg, size_t size) {
-	isc_event_t *event;
-	void *deconst_arg;
-
-	REQUIRE(size >= sizeof(struct isc_event));
-	REQUIRE(action != NULL);
-
-	event = isc_mem_get(mctx, size);
-
-	/*
-	 * Removing the const attribute from "arg" is the best of two
-	 * evils here.  If the event->ev_arg member is made const, then
-	 * it affects a great many users of the task/event subsystem
-	 * which are not passing in an "arg" which starts its life as
-	 * const.  Changing isc_event_allocate() and isc_task_onshutdown()
-	 * to not have "arg" prototyped as const (which is quite legitimate,
-	 * because neither of those functions modify arg) can cause
-	 * compiler whining anytime someone does want to use a const
-	 * arg that they themselves never modify, such as with
-	 * gcc -Wwrite-strings and using a string "arg".
-	 */
-	DE_CONST(arg, deconst_arg);
-
-	ISC_EVENT_INIT(event, size, 0, NULL, type, action, deconst_arg, sender,
-		       destroy, mctx);
-
-	return (event);
-}
-
 void
 isc_event_free(isc_event_t **eventp) {
 	isc_event_t *event;
diff --git a/lib/isc/include/isc/event.h b/lib/isc/include/isc/event.h
index 2349f3140c..8d7048cd52 100644
--- a/lib/isc/include/isc/event.h
+++ b/lib/isc/include/isc/event.h
@@ -82,9 +82,6 @@ ISC_LANG_BEGINDECLS
 isc_event_t *
 isc_event_allocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type,
 		   isc_taskaction_t action, void *arg, size_t size);
-isc_event_t *
-isc_event_constallocate(isc_mem_t *mctx, void *sender, isc_eventtype_t type,
-			isc_taskaction_t action, const void *arg, size_t size);
 /*%<
  * Allocate an event structure.
  *