diff --git a/src/miner.cpp b/src/miner.cpp
index 45b70040f..327382089 100644
--- a/src/miner.cpp
+++ b/src/miner.cpp
@@ -109,6 +109,7 @@ extern int32_t ASSETCHAINS_SEED,IS_KOMODO_NOTARY,USE_EXTERNAL_PUBKEY,KOMODO_CHOS
 extern uint64_t ASSETCHAINS_REWARD,ASSETCHAINS_COMMISSION,ASSETCHAINS_STAKED;
 extern char ASSETCHAINS_SYMBOL[KOMODO_ASSETCHAIN_MAXLEN];
 extern std::string NOTARY_PUBKEY,ASSETCHAINS_OVERRIDE_PUBKEY;
+void vcalc_sha256(char deprecated[(256 >> 3) * 2 + 1],uint8_t hash[256 >> 3],uint8_t *src,int32_t len);
 
 extern uint8_t NOTARY_PUBKEY33[33],ASSETCHAINS_OVERRIDE_PUBKEY33[33];
 uint32_t Mining_start,Mining_height;