diff --git a/domain/consensus/processes/transactionvalidator/mass.go b/domain/consensus/processes/transactionvalidator/mass.go
index a6d6e892a..d57500264 100644
--- a/domain/consensus/processes/transactionvalidator/mass.go
+++ b/domain/consensus/processes/transactionvalidator/mass.go
@@ -4,6 +4,7 @@ import (
 	"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
 	"github.com/kaspanet/kaspad/domain/consensus/ruleerrors"
 	"github.com/kaspanet/kaspad/domain/consensus/utils/estimatedsize"
+	"github.com/kaspanet/kaspad/domain/consensus/utils/transactionhelper"
 	"github.com/kaspanet/kaspad/domain/consensus/utils/txscript"
 	"github.com/pkg/errors"
 )
@@ -34,6 +35,10 @@ func (v *transactionValidator) transactionMassStandalonePart(tx *externalapi.Dom
 }
 
 func (v *transactionValidator) transactionMass(tx *externalapi.DomainTransaction) (uint64, error) {
+	if transactionhelper.IsCoinBase(tx) {
+		return 0, nil
+	}
+
 	standaloneMass := v.transactionMassStandalonePart(tx)
 	sigOpsCount := uint64(0)
 	for _, input := range tx.Inputs {
diff --git a/domain/consensus/utils/estimatedsize/transaction_estimated_size.go b/domain/consensus/utils/estimatedsize/transaction_estimated_size.go
index 40b0dd012..5977db976 100644
--- a/domain/consensus/utils/estimatedsize/transaction_estimated_size.go
+++ b/domain/consensus/utils/estimatedsize/transaction_estimated_size.go
@@ -2,6 +2,7 @@ package estimatedsize
 
 import (
 	"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
+	"github.com/kaspanet/kaspad/domain/consensus/utils/transactionhelper"
 )
 
 // TransactionEstimatedSerializedSize is the estimated size of a transaction in some
@@ -9,6 +10,9 @@ import (
 // it's only used as the size component in the transaction mass and block size limit
 // calculation.
 func TransactionEstimatedSerializedSize(tx *externalapi.DomainTransaction) uint64 {
+	if transactionhelper.IsCoinBase(tx) {
+		return 0
+	}
 	size := uint64(0)
 
 	size += 8 // number of inputs (uint64)