1 files changed, 3 insertions, 3 deletions
diff --git a/packages/web3-typescript-typings/index.d.ts b/packages/web3-typescript-typings/index.d.ts
index 3deb96c24..95772364f 100644
--- a/packages/web3-typescript-typings/index.d.ts
+++ b/packages/web3-typescript-typings/index.d.ts
@@ -50,11 +50,11 @@ declare module 'web3' {
 
         interface FunctionDescription {
             type: "function" | "constructor" | "fallback";
-            name: string;
+            name?: string;
             inputs: Array<FunctionParameter>;
             outputs?: Array<FunctionParameter>;
-            constant: boolean;
-            payable: boolean;
+            constant?: boolean;
+            payable?: boolean;
         }
 
         interface EventParameter {