diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index 289061063ca..e08e2bb64f1 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -1245,23 +1245,6 @@ func (s *BlockChainAPI) Call(ctx context.Context, args TransactionArgs, blockNrO
 	return result.Return(), result.Err
 }
 
-type estimateGasError struct {
-	error  string // Concrete error type if it's failed to estimate gas usage
-	vmerr  error  // Additional field, it's non-nil if the given transaction is invalid
-	revert string // Additional field, it's non-empty if the transaction is reverted and reason is provided
-}
-
-func (e estimateGasError) Error() string {
-	errMsg := e.error
-	if e.vmerr != nil {
-		errMsg += fmt.Sprintf(" (%v)", e.vmerr)
-	}
-	if e.revert != "" {
-		errMsg += fmt.Sprintf(" (%s)", e.revert)
-	}
-	return errMsg
-}
-
 func DoEstimateGas(ctx context.Context, b Backend, args TransactionArgs, blockNrOrHash rpc.BlockNumberOrHash, overrides *StateOverride, gasCap uint64) (hexutil.Uint64, error) {
 	// Retrieve the base state and mutate it with any overrides
 	state, _, err := b.StateAndHeaderByNumberOrHash(ctx, blockNrOrHash)