1 files changed, 3 insertions, 2 deletions
diff --git a/packages/sol-compiler/src/utils/encoder.ts b/packages/sol-compiler/src/utils/encoder.ts
index 0f2d75691..6527304d6 100644
--- a/packages/sol-compiler/src/utils/encoder.ts
+++ b/packages/sol-compiler/src/utils/encoder.ts
@@ -1,4 +1,4 @@
-import { AbiDefinition, AbiType, ContractAbi, DataItem } from 'ethereum-types';
+import { AbiDefinition, AbiType, ConstructorAbi, ContractAbi, DataItem } from 'ethereum-types';
 import * as _ from 'lodash';
 import * as web3Abi from 'web3-eth-abi';
 
@@ -7,7 +7,8 @@ export const encoder = {
         const constructorTypes: string[] = [];
         _.each(abi, (element: AbiDefinition) => {
             if (element.type === AbiType.Constructor) {
-                _.each(element.inputs, (input: DataItem) => {
+                const constuctorAbi = element as ConstructorAbi;
+                _.each(constuctorAbi.inputs, (input: DataItem) => {
                     constructorTypes.push(input.type);
                 });
             }