diff --git a/src/ehooks.c b/src/ehooks.c
index 535066e7..5d12d003 100644
--- a/src/ehooks.c
+++ b/src/ehooks.c
@@ -52,9 +52,12 @@ void *
 ehooks_default_alloc_impl(tsdn_t *tsdn, void *new_addr, size_t size,
     size_t alignment, bool *zero, bool *commit, unsigned arena_ind) {
 	arena_t *arena = arena_get(tsdn, arena_ind, false);
-	void *ret = extent_alloc_core(tsdn, arena, new_addr, size, alignment, zero,
-	    commit, (dss_prec_t)atomic_load_u(&arena->dss_prec,
-	    ATOMIC_RELAXED));
+	/* NULL arena indicates arena_create. */
+	assert(arena != NULL || alignment == HUGEPAGE);
+	dss_prec_t dss = (arena == NULL) ? dss_prec_disabled :
+	    (dss_prec_t)atomic_load_u(&arena->dss_prec, ATOMIC_RELAXED);
+	void *ret = extent_alloc_core(tsdn, arena, new_addr, size, alignment,
+	    zero, commit, dss);
 	if (have_madvise_huge && ret) {
 		pages_set_thp_state(ret, size);
 	}
@@ -64,20 +67,8 @@ ehooks_default_alloc_impl(tsdn_t *tsdn, void *new_addr, size_t size,
 static void *
 ehooks_default_alloc(extent_hooks_t *extent_hooks, void *new_addr, size_t size,
     size_t alignment, bool *zero, bool *commit, unsigned arena_ind) {
-	tsdn_t *tsdn;
-	arena_t *arena;
-
-	tsdn = tsdn_fetch();
-	arena = arena_get(tsdn, arena_ind, false);
-	/*
-	 * The arena we're allocating on behalf of must have been initialized
-	 * already.
-	 */
-	assert(arena != NULL);
-
-	return ehooks_default_alloc_impl(tsdn, new_addr, size,
-	    ALIGNMENT_CEILING(alignment, PAGE), zero, commit,
-	    arena_ind_get(arena));
+	return ehooks_default_alloc_impl(tsdn_fetch(), new_addr, size,
+	    ALIGNMENT_CEILING(alignment, PAGE), zero, commit, arena_ind);
 }
 
 bool
diff --git a/test/unit/arena_reset.c b/test/unit/arena_reset.c
index a2cf3e54..589689c0 100644
--- a/test/unit/arena_reset.c
+++ b/test/unit/arena_reset.c
@@ -255,6 +255,21 @@ TEST_BEGIN(test_arena_destroy_hooks_default) {
 	do_arena_reset_post(ptrs, nptrs, arena_ind);
 
 	do_arena_destroy(arena_ind_another);
+
+	/* Try arena.create with custom hooks. */
+	size_t sz = sizeof(extent_hooks_t *);
+	extent_hooks_t *default_hooks;
+	expect_d_eq(mallctl("arena.0.extent_hooks", (void *)&default_hooks,
+	    &sz, NULL, 0), 0, "Unexpected mallctlnametomib() failure");
+
+	/* Default impl; but wrapped as "customized". */
+	extent_hooks_t new_hooks = *default_hooks;
+	extent_hooks_t *hook = &new_hooks;
+	sz = sizeof(unsigned);
+	expect_d_eq(mallctl("arenas.create", (void *)&arena_ind, &sz,
+	    (void *)&hook, sizeof(void *)), 0,
+	    "Unexpected mallctl() failure");
+	do_arena_destroy(arena_ind);
 }
 TEST_END