diff --git a/consensus/block.go b/consensus/block.go
index 93038f3..5c230b4 100644
--- a/consensus/block.go
+++ b/consensus/block.go
@@ -67,8 +67,10 @@ func expectedMinerTxVersion(forks []config.HardFork, height uint64) uint64 {
 		return types.VersionPostHF5
 	case config.IsHardForkActive(forks, config.HF4Zarcanum, height):
 		return types.VersionPostHF4
-	default:
+	case config.IsHardForkActive(forks, config.HF1, height):
 		return types.VersionPreHF4
+	default:
+		return types.VersionInitial
 	}
 }
 
diff --git a/consensus/block_test.go b/consensus/block_test.go
index 6a360c0..3655815 100644
--- a/consensus/block_test.go
+++ b/consensus/block_test.go
@@ -66,7 +66,7 @@ func TestCheckTimestamp_Ugly(t *testing.T) {
 
 func validMinerTx(height uint64) *types.Transaction {
 	return &types.Transaction{
-		Version: types.VersionPreHF4,
+		Version: types.VersionInitial,
 		Vin:     []types.TxInput{types.TxInputGenesis{Height: height}},
 		Vout: []types.TxOutput{
 			types.TxOutputBare{Amount: config.BlockReward, Target: types.TxOutToKey{Key: types.PublicKey{1}}},
@@ -134,11 +134,21 @@ func TestValidateMinerTx_Version_Good(t *testing.T) {
 		height uint64
 	}{
 		{
-			name:   "mainnet_pre_hf4_v1",
+			name:   "mainnet_pre_hf1_v0",
 			forks:  config.MainnetForks,
 			height: 100,
 			tx:     validMinerTx(100),
 		},
+		{
+			name:   "mainnet_post_hf1_pre_hf4_v1",
+			forks:  config.MainnetForks,
+			height: 10081,
+			tx: &types.Transaction{
+				Version: types.VersionPreHF4,
+				Vin:     []types.TxInput{types.TxInputGenesis{Height: 10081}},
+				Vout:    []types.TxOutput{types.TxOutputBare{Amount: config.BlockReward, Target: types.TxOutToKey{Key: types.PublicKey{1}}}},
+			},
+		},
 		{
 			name:   "testnet_post_hf4_v2",
 			forks:  config.TestnetForks,
@@ -178,15 +188,25 @@ func TestValidateMinerTx_Version_Bad(t *testing.T) {
 		tx     *types.Transaction
 	}{
 		{
-			name:   "mainnet_pre_hf4_v0",
+			name:   "mainnet_pre_hf1_v1",
 			forks:  config.MainnetForks,
 			height: 100,
 			tx: &types.Transaction{
-				Version: types.VersionInitial,
+				Version: types.VersionPreHF4,
 				Vin:     []types.TxInput{types.TxInputGenesis{Height: 100}},
 				Vout:    []types.TxOutput{types.TxOutputBare{Amount: config.BlockReward, Target: types.TxOutToKey{Key: types.PublicKey{1}}}},
 			},
 		},
+		{
+			name:   "mainnet_post_hf1_pre_hf4_v0",
+			forks:  config.MainnetForks,
+			height: 10081,
+			tx: &types.Transaction{
+				Version: types.VersionInitial,
+				Vin:     []types.TxInput{types.TxInputGenesis{Height: 10081}},
+				Vout:    []types.TxOutput{types.TxOutputBare{Amount: config.BlockReward, Target: types.TxOutToKey{Key: types.PublicKey{1}}}},
+			},
+		},
 		{
 			name:   "testnet_post_hf4_v1",
 			forks:  config.TestnetForks,