diff --git a/src/smartcontracts/interface.ts b/src/smartcontracts/interface.ts
index 2aa1815a..08e46232 100644
--- a/src/smartcontracts/interface.ts
+++ b/src/smartcontracts/interface.ts
@@ -93,6 +93,5 @@ export interface ICodeMetadata {
 }
 
 export interface IContractFunction {
-    name: string;
     toString(): string;
 }
diff --git a/src/smartcontracts/transactionPayloadBuilders.ts b/src/smartcontracts/transactionPayloadBuilders.ts
index f1bf9b37..84c82542 100644
--- a/src/smartcontracts/transactionPayloadBuilders.ts
+++ b/src/smartcontracts/transactionPayloadBuilders.ts
@@ -154,7 +154,7 @@ export class ContractCallPayloadBuilder {
     build(): TransactionPayload {
         guardValueIsSet("calledFunction", this.contractFunction);
 
-        let data = this.contractFunction!.name;
+        let data = this.contractFunction!.toString();
         data = appendArgumentsToString(data, this.arguments);
 
         return new TransactionPayload(data);
diff --git a/src/testutils/mockProvider.ts b/src/testutils/mockProvider.ts
index f9808b4f..884ca649 100644
--- a/src/testutils/mockProvider.ts
+++ b/src/testutils/mockProvider.ts
@@ -58,7 +58,7 @@ export class MockProvider {
     }
 
     mockQueryContractOnFunction(functionName: string, response: IContractQueryResponse) {
-        let predicate = (query: Query) => query.func.name == functionName;
+        let predicate = (query: Query) => query.func.toString() == functionName;
         this.queryContractResponders.push(new QueryContractResponder(predicate, response));
     }