3 files changed, 8 insertions, 8 deletions

diff --git a/src/0x.ts b/src/0x.ts
index 25ad538b9..5938d558a 100644
--- a/src/0x.ts
+++ b/src/0x.ts
@@ -169,9 +169,9 @@ export class ZeroEx {
     public async setProviderAsync(provider: Web3Provider) {
         this._web3Wrapper.setProvider(provider);
         await (this.exchange as any)._invalidateContractInstancesAsync();
-        this.tokenRegistry.invalidateContractInstance();
+        (this.tokenRegistry as any)._invalidateContractInstance();
         await (this.token as any)._invalidateContractInstancesAsync();
-        this.proxy.invalidateContractInstance();
+        (this.proxy as any)._invalidateContractInstance();
     }
     /**
      * Get user Ethereum addresses available through the supplied web3 instance available for sending transactions.
diff --git a/src/contract_wrappers/proxy_wrapper.ts b/src/contract_wrappers/proxy_wrapper.ts
index bdf163f35..05d4e142c 100644
--- a/src/contract_wrappers/proxy_wrapper.ts
+++ b/src/contract_wrappers/proxy_wrapper.ts
@@ -9,9 +9,6 @@ import {ProxyContract} from '../types';
  */
 export class ProxyWrapper extends ContractWrapper {
     private _proxyContractIfExists?: ProxyContract;
-    public invalidateContractInstance(): void {
-        delete this._proxyContractIfExists;
-    }
     /**
      * Check if the Exchange contract address is authorized by the Proxy contract.
      * @param   exchangeContractAddress     The hex encoded address of the Exchange contract to call.
@@ -32,6 +29,9 @@ export class ProxyWrapper extends ContractWrapper {
         const authorizedAddresses = await proxyContractInstance.getAuthorizedAddresses.call();
         return authorizedAddresses;
     }
+    private _invalidateContractInstance(): void {
+        delete this._proxyContractIfExists;
+    }
     private async _getProxyContractAsync(): Promise<ProxyContract> {
         if (!_.isUndefined(this._proxyContractIfExists)) {
             return this._proxyContractIfExists;
diff --git a/src/contract_wrappers/token_registry_wrapper.ts b/src/contract_wrappers/token_registry_wrapper.ts
index 3e87e4852..c9f21e46f 100644
--- a/src/contract_wrappers/token_registry_wrapper.ts
+++ b/src/contract_wrappers/token_registry_wrapper.ts
@@ -13,9 +13,6 @@ export class TokenRegistryWrapper extends ContractWrapper {
     constructor(web3Wrapper: Web3Wrapper) {
         super(web3Wrapper);
     }
-    public invalidateContractInstance(): void {
-        delete this._tokenRegistryContractIfExists;
-    }
     /**
      * Retrieves all the tokens currently listed in the Token Registry smart contract
      * @return  An array of objects that conform to the Token interface.
@@ -40,6 +37,9 @@ export class TokenRegistryWrapper extends ContractWrapper {
         });
         return tokens;
     }
+    private _invalidateContractInstance(): void {
+        delete this._tokenRegistryContractIfExists;
+    }
     private async _getTokenRegistryContractAsync(): Promise<TokenRegistryContract> {
         if (!_.isUndefined(this._tokenRegistryContractIfExists)) {
             return this._tokenRegistryContractIfExists;