diff --git a/evmcore/evm.go b/evmcore/evm.go
index 8958754f1..d4dfcb496 100644
--- a/evmcore/evm.go
+++ b/evmcore/evm.go
@@ -48,7 +48,7 @@ func NewEVMBlockContext(header *EvmHeader, chain DummyChain, author *common.Addr
 	return vm.BlockContext{
 		CanTransfer: CanTransfer,
 		Transfer:    Transfer,
-		GetHash:     GetHashFn(header, chain),
+		GetHash:     GetHashFn(*header, chain),
 		Coinbase:    beneficiary,
 		BlockNumber: new(big.Int).Set(header.Number),
 		Time:        new(big.Int).SetUint64(uint64(header.Time.Unix())),
@@ -67,7 +67,7 @@ func NewEVMTxContext(msg Message) vm.TxContext {
 }
 
 // GetHashFn returns a GetHashFunc which retrieves header hashes by number
-func GetHashFn(ref *EvmHeader, chain DummyChain) func(n uint64) common.Hash {
+func GetHashFn(ref EvmHeader, chain DummyChain) func(n uint64) common.Hash {
 	// Cache will initially contain [refHash.parent],
 	// Then fill up with [refHash.p, refHash.pp, refHash.ppp, ...]
 	var cache []common.Hash