diff --git a/treetrie.h b/treetrie.h
index 983b31c..67207ef 100644
--- a/treetrie.h
+++ b/treetrie.h
@@ -79,7 +79,6 @@ typedef struct tt_arena_t {
   /* Fields for the Robin Hood hashset used for hashconsing of tt_nodes */
   unsigned int max_probe;
   unsigned int table_length;
-  tt_hash_t *hashes;
   tt_hashtable_entry_t *table;
 
   tt_header_t *headers;