diff --git a/beacon_chain/spec/digest.nim b/beacon_chain/spec/digest.nim
index 584d6711c..7db7bf45f 100644
--- a/beacon_chain/spec/digest.nim
+++ b/beacon_chain/spec/digest.nim
@@ -25,10 +25,11 @@ import
   chronicles,
   nimcrypto/[sha2, hash],
   stew/byteutils,
-  hashes
+  hashes,
+  eth/common/eth_types_json_serialization
 
 export
-  hash.`$`, sha2
+  hash.`$`, sha2, writeValue, readValue
 
 type
   Eth2Digest* = MDigest[32 * 8] ## `hash32` from spec