4 files changed, 9 insertions, 9 deletions
diff --git a/packages/0x.js/src/0x.ts b/packages/0x.js/src/0x.ts
index 3dc98d5da..0616b3078 100644
--- a/packages/0x.js/src/0x.ts
+++ b/packages/0x.js/src/0x.ts
@@ -205,12 +205,13 @@ export class ZeroEx {
      * Sets a new web3 provider for 0x.js. Updating the provider will stop all
      * subscriptions so you will need to re-subscribe to all events relevant to your app after this call.
      * @param   provider    The Web3Provider you would like the 0x.js library to use from now on.
+     * @param   networkId   The id of the network your provider is connected to
      */
-    public async setProviderAsync(provider: Web3Provider) {
-        this._web3Wrapper.setProvider(provider);
-        await (this.exchange as any)._invalidateContractInstancesAsync();
+    public setProvider(provider: Web3Provider, networkId: number): void {
+        this._web3Wrapper.setProvider(provider, networkId);
+        (this.exchange as any)._invalidateContractInstances();
         (this.tokenRegistry as any)._invalidateContractInstance();
-        await (this.token as any)._invalidateContractInstancesAsync();
+        (this.token as any)._invalidateContractInstances();
         (this.proxy as any)._invalidateContractInstance();
         (this.etherToken as any)._invalidateContractInstance();
     }
diff --git a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
index 637c27361..1ff9ace3b 100644
--- a/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/exchange_wrapper.ts
@@ -827,7 +827,7 @@ export class ExchangeWrapper extends ContractWrapper {
         );
         return contractAddress;
     }
-    private async _invalidateContractInstancesAsync(): Promise<void> {
+    private _invalidateContractInstances(): void {
         this.unsubscribeAll();
         delete this._exchangeContractIfExists;
     }
diff --git a/packages/0x.js/src/contract_wrappers/token_wrapper.ts b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
index cd1104580..5c6cfeaed 100644
--- a/packages/0x.js/src/contract_wrappers/token_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/token_wrapper.ts
@@ -293,7 +293,7 @@ export class TokenWrapper extends ContractWrapper {
         );
         return logs;
     }
-    private _invalidateContractInstancesAsync(): void {
+    private _invalidateContractInstances(): void {
         this.unsubscribeAll();
         this._tokenContractsByAddress = {};
     }
diff --git a/packages/0x.js/src/web3_wrapper.ts b/packages/0x.js/src/web3_wrapper.ts
index 00f91106b..557cd28e5 100644
--- a/packages/0x.js/src/web3_wrapper.ts
+++ b/packages/0x.js/src/web3_wrapper.ts
@@ -21,7 +21,6 @@ export class Web3Wrapper {
     private web3: Web3;
     private networkId: number;
     private defaults: Partial<Web3.TxData>;
-    private networkIdIfExists?: number;
     private jsonRpcRequestId: number;
     constructor(provider: Web3.Provider, networkId: number, defaults?: Partial<Web3.TxData>) {
         if (_.isUndefined((provider as any).sendAsync)) {
@@ -36,8 +35,8 @@ export class Web3Wrapper {
         this.defaults = defaults || {};
         this.jsonRpcRequestId = 0;
     }
-    public setProvider(provider: Web3.Provider) {
-        delete this.networkIdIfExists;
+    public setProvider(provider: Web3.Provider, networkId: number) {
+        this.networkId = networkId;
         this.web3.setProvider(provider);
     }
     public isAddress(address: string): boolean {