diff --git a/app/scripts/lib/rpc-method-middleware/handlers/switch-ethereum-chain.js b/app/scripts/lib/rpc-method-middleware/handlers/switch-ethereum-chain.js
index 6d71ba602..e2137da87 100644
--- a/app/scripts/lib/rpc-method-middleware/handlers/switch-ethereum-chain.js
+++ b/app/scripts/lib/rpc-method-middleware/handlers/switch-ethereum-chain.js
@@ -116,7 +116,7 @@ async function switchEthereumChainHandler(
       if (
         Object.values(BUILT_IN_INFURA_NETWORKS)
           .map(({ chainId: id }) => id)
-          .includes(chainId)
+          .includes(_chainId)
       ) {
         await setProviderType(approvedRequestData.type);
       } else {
diff --git a/app/scripts/lib/rpc-method-middleware/handlers/switch-ethereum-chain.test.js b/app/scripts/lib/rpc-method-middleware/handlers/switch-ethereum-chain.test.js
new file mode 100644
index 000000000..410697214
--- /dev/null
+++ b/app/scripts/lib/rpc-method-middleware/handlers/switch-ethereum-chain.test.js
@@ -0,0 +1,128 @@
+import {
+  CHAIN_IDS,
+  NETWORK_TYPES,
+} from '../../../../../shared/constants/network';
+import switchEthereumChain from './switch-ethereum-chain';
+
+const NON_INFURA_CHAIN_ID = '0x123456789';
+
+const mockRequestUserApproval = ({ requestData }) => {
+  return Promise.resolve(requestData);
+};
+
+const MOCK_MAINNET_CONFIGURATION = {
+  id: 123,
+  chainId: CHAIN_IDS.MAINNET,
+  type: NETWORK_TYPES.MAINNET,
+};
+const MOCK_LINEA_MAINNET_CONFIGURATION = {
+  id: 123,
+  chainId: CHAIN_IDS.LINEA_MAINNET,
+  type: NETWORK_TYPES.LINEA_MAINNET,
+};
+
+describe('switchEthereumChainHandler', () => {
+  it('should call setProviderType when switching to a built in infura network', async () => {
+    const mockSetProviderType = jest.fn();
+    const mockSetActiveNetwork = jest.fn();
+    const switchEthereumChainHandler = switchEthereumChain.implementation;
+    await switchEthereumChainHandler(
+      {
+        origin: 'example.com',
+        params: [{ chainId: CHAIN_IDS.MAINNET }],
+      },
+      {},
+      jest.fn(),
+      jest.fn(),
+      {
+        getCurrentChainId: () => NON_INFURA_CHAIN_ID,
+        findNetworkConfigurationBy: () => MOCK_MAINNET_CONFIGURATION,
+        setProviderType: mockSetProviderType,
+        setActiveNetwork: mockSetActiveNetwork,
+        requestUserApproval: mockRequestUserApproval,
+      },
+    );
+    expect(mockSetProviderType).toHaveBeenCalledTimes(1);
+    expect(mockSetProviderType).toHaveBeenCalledWith(
+      MOCK_MAINNET_CONFIGURATION.type,
+    );
+  });
+
+  it('should call setProviderType when switching to a built in infura network, when chainId from request is lower case', async () => {
+    const mockSetProviderType = jest.fn();
+    const mockSetActiveNetwork = jest.fn();
+    const switchEthereumChainHandler = switchEthereumChain.implementation;
+    await switchEthereumChainHandler(
+      {
+        origin: 'example.com',
+        params: [{ chainId: CHAIN_IDS.LINEA_MAINNET.toLowerCase() }],
+      },
+      {},
+      jest.fn(),
+      jest.fn(),
+      {
+        getCurrentChainId: () => NON_INFURA_CHAIN_ID,
+        findNetworkConfigurationBy: () => MOCK_LINEA_MAINNET_CONFIGURATION,
+        setProviderType: mockSetProviderType,
+        setActiveNetwork: mockSetActiveNetwork,
+        requestUserApproval: mockRequestUserApproval,
+      },
+    );
+    expect(mockSetProviderType).toHaveBeenCalledTimes(1);
+    expect(mockSetProviderType).toHaveBeenCalledWith(
+      MOCK_LINEA_MAINNET_CONFIGURATION.type,
+    );
+  });
+
+  it('should call setProviderType when switching to a built in infura network, when chainId from request is upper case', async () => {
+    const mockSetProviderType = jest.fn();
+    const mockSetActiveNetwork = jest.fn();
+    const switchEthereumChainHandler = switchEthereumChain.implementation;
+    await switchEthereumChainHandler(
+      {
+        origin: 'example.com',
+        params: [{ chainId: CHAIN_IDS.LINEA_MAINNET.toUpperCase() }],
+      },
+      {},
+      jest.fn(),
+      jest.fn(),
+      {
+        getCurrentChainId: () => NON_INFURA_CHAIN_ID,
+        findNetworkConfigurationBy: () => MOCK_LINEA_MAINNET_CONFIGURATION,
+        setProviderType: mockSetProviderType,
+        setActiveNetwork: mockSetActiveNetwork,
+        requestUserApproval: mockRequestUserApproval,
+      },
+    );
+    expect(mockSetProviderType).toHaveBeenCalledTimes(1);
+    expect(mockSetProviderType).toHaveBeenCalledWith(
+      MOCK_LINEA_MAINNET_CONFIGURATION.type,
+    );
+  });
+
+  it('should call setActiveNetwork when switching to a custom network', async () => {
+    const mockSetProviderType = jest.fn();
+    const mockSetActiveNetwork = jest.fn();
+    const switchEthereumChainHandler = switchEthereumChain.implementation;
+    await switchEthereumChainHandler(
+      {
+        origin: 'example.com',
+        params: [{ chainId: NON_INFURA_CHAIN_ID }],
+      },
+      {},
+      jest.fn(),
+      jest.fn(),
+      {
+        getCurrentChainId: () => CHAIN_IDS.MAINNET,
+        findNetworkConfigurationBy: () => MOCK_MAINNET_CONFIGURATION,
+        setProviderType: mockSetProviderType,
+        setActiveNetwork: mockSetActiveNetwork,
+        requestUserApproval: mockRequestUserApproval,
+      },
+    );
+    expect(mockSetActiveNetwork).toHaveBeenCalledTimes(1);
+    expect(mockSetActiveNetwork).toHaveBeenCalledWith(
+      MOCK_MAINNET_CONFIGURATION.id,
+    );
+  });
+});