diff --git a/src/hash-store.c b/src/hash-store.c
index 8a6cb67..89ade06 100644
--- a/src/hash-store.c
+++ b/src/hash-store.c
@@ -35,8 +35,7 @@ hash_store_string8_to_key(Table *table, String8 value)
   {
     String8 *new_str8 = arena_push(table->ptr_arena, String8);
     new_str8->content =
-      (u8*) arena_allocate(table->str8_arena, sizeof(u8) * value.length);
-    new_str8->length = value.length;
+      arena_push_array(table->str8_arena, u8, value.length);
 
     memory_copy(new_str8->content, value.content, value.length);
     table->str8_count += 1;