diff --git a/module/zfs/dsl_destroy.c b/module/zfs/dsl_destroy.c
index d15c446c70..2f98e87ed3 100644
--- a/module/zfs/dsl_destroy.c
+++ b/module/zfs/dsl_destroy.c
@@ -1105,9 +1105,10 @@ dsl_destroy_head(const char *name)
 		/*
 		 * Head deletion is processed in one txg on old pools;
 		 * remove the objects from open context so that the txg sync
-		 * is not too long.
+		 * is not too long. This optimization can only work for
+		 * encrypted datasets if the wrapping key is loaded.
 		 */
-		error = dmu_objset_own(name, DMU_OST_ANY, B_FALSE, B_FALSE,
+		error = dmu_objset_own(name, DMU_OST_ANY, B_FALSE, B_TRUE,
 		    FTAG, &os);
 		if (error == 0) {
 			uint64_t prev_snap_txg =
@@ -1119,7 +1120,7 @@ dsl_destroy_head(const char *name)
 				(void) dmu_free_long_object(os, obj);
 			/* sync out all frees */
 			txg_wait_synced(dmu_objset_pool(os), 0);
-			dmu_objset_disown(os, B_FALSE, FTAG);
+			dmu_objset_disown(os, B_TRUE, FTAG);
 		}
 	}