diff --git a/src/0x.ts b/src/0x.ts
index d42c16ca60..25ad538b9e 100644
--- a/src/0x.ts
+++ b/src/0x.ts
@@ -168,9 +168,9 @@ export class ZeroEx {
      */
     public async setProviderAsync(provider: Web3Provider) {
         this._web3Wrapper.setProvider(provider);
-        await this.exchange.invalidateContractInstancesAsync();
+        await (this.exchange as any)._invalidateContractInstancesAsync();
         this.tokenRegistry.invalidateContractInstance();
-        await this.token.invalidateContractInstancesAsync();
+        await (this.token as any)._invalidateContractInstancesAsync();
         this.proxy.invalidateContractInstance();
     }
     /**
diff --git a/src/contract_wrappers/exchange_wrapper.ts b/src/contract_wrappers/exchange_wrapper.ts
index 9d94283276..72f00ee915 100644
--- a/src/contract_wrappers/exchange_wrapper.ts
+++ b/src/contract_wrappers/exchange_wrapper.ts
@@ -92,10 +92,6 @@ export class ExchangeWrapper extends ContractWrapper {
         this._exchangeLogEventEmitters = [];
         this._exchangeContractByAddress = {};
     }
-    public async invalidateContractInstancesAsync(): Promise<void> {
-        await this.stopWatchingAllEventsAsync();
-        this._exchangeContractByAddress = {};
-    }
     /**
      * Returns the unavailable takerAmount of an order. Unavailable amount is defined as the total
      * amount that has been filled or cancelled. The remaining takerAmount can be calculated by
@@ -658,6 +654,10 @@ export class ExchangeWrapper extends ContractWrapper {
         await Promise.all(stopWatchingPromises);
         this._exchangeLogEventEmitters = [];
     }
+    private async _invalidateContractInstancesAsync(): Promise<void> {
+        await this.stopWatchingAllEventsAsync();
+        this._exchangeContractByAddress = {};
+    }
     private async _isExchangeContractAddressProxyAuthorizedAsync(exchangeContractAddress: string): Promise<boolean> {
         const isAuthorized = await this._proxyWrapper.isAuthorizedAsync(exchangeContractAddress);
         return isAuthorized;
diff --git a/src/contract_wrappers/token_wrapper.ts b/src/contract_wrappers/token_wrapper.ts
index 1ad1cd9d65..fdf7118232 100644
--- a/src/contract_wrappers/token_wrapper.ts
+++ b/src/contract_wrappers/token_wrapper.ts
@@ -36,10 +36,6 @@ export class TokenWrapper extends ContractWrapper {
         this._tokenContractsByAddress = {};
         this._tokenLogEventEmitters = [];
     }
-    public async invalidateContractInstancesAsync(): Promise<void> {
-        await this.stopWatchingAllEventsAsync();
-        this._tokenContractsByAddress = {};
-    }
     /**
      * Retrieves an owner's ERC20 token balance.
      * @param   tokenAddress    The hex encoded contract Ethereum address where the ERC20 token is deployed.
@@ -236,6 +232,10 @@ export class TokenWrapper extends ContractWrapper {
         await Promise.all(stopWatchingPromises);
         this._tokenLogEventEmitters = [];
     }
+    private async _invalidateContractInstancesAsync(): Promise<void> {
+        await this.stopWatchingAllEventsAsync();
+        this._tokenContractsByAddress = {};
+    }
     private async _getTokenContractAsync(tokenAddress: string): Promise<TokenContract> {
         let tokenContract = this._tokenContractsByAddress[tokenAddress];
         if (!_.isUndefined(tokenContract)) {