diff --git a/src/wallet/asyncrpcoperation_shieldcoinbase.cpp b/src/wallet/asyncrpcoperation_shieldcoinbase.cpp
index 8c8de21e..a771a116 100644
--- a/src/wallet/asyncrpcoperation_shieldcoinbase.cpp
+++ b/src/wallet/asyncrpcoperation_shieldcoinbase.cpp
@@ -279,7 +279,12 @@ void AsyncRPCOperation_shieldcoinbase::sign_send_raw_transaction(UniValue obj)
 
 
 UniValue AsyncRPCOperation_shieldcoinbase::perform_joinsplit(ShieldCoinbaseJSInfo & info) {
-    uint256 anchor = pcoinsTip->GetBestAnchor();
+    uint256 anchor;
+    {
+        LOCK(cs_main);
+        anchor = pcoinsTip->GetBestAnchor();
+    }
+
     if (anchor.IsNull()) {
         throw std::runtime_error("anchor is null");
     }
@@ -338,7 +343,7 @@ UniValue AsyncRPCOperation_shieldcoinbase::perform_joinsplit(ShieldCoinbaseJSInf
     // Empty output script.
     CScript scriptCode;
     CTransaction signTx(mtx);
-    uint256 dataToBeSigned = SignatureHash(scriptCode, signTx, NOT_AN_INPUT, SIGHASH_ALL);
+    uint256 dataToBeSigned = SignatureHash(scriptCode, signTx, NOT_AN_INPUT, SIGHASH_ALL | SIGHASH_FORKID, FORKID_IN_USE);
 
     // Add the signature
     if (!(crypto_sign_detached(&mtx.joinSplitSig[0], NULL,