diff --git a/src/crypto/hash-ops.h b/src/crypto/hash-ops.h
index de91734d4..8cbc8d466 100644
--- a/src/crypto/hash-ops.h
+++ b/src/crypto/hash-ops.h
@@ -88,7 +88,7 @@ void hash_extra_skein(const void *data, size_t length, char *hash);
 
 void tree_hash(const char (*hashes)[HASH_SIZE], size_t count, char *root_hash);
 
-#define RX_BLOCK_VERSION	12
+#define RX_BLOCK_VERSION	13
 void rx_slow_hash_allocate_state(void);
 void rx_slow_hash_free_state(void);
 uint64_t rx_seedheight(const uint64_t height);