diff --git a/src/PreviewManager.ts b/src/PreviewManager.ts
index 269b8cd..29da2b8 100644
--- a/src/PreviewManager.ts
+++ b/src/PreviewManager.ts
@@ -1,6 +1,6 @@
 'use strict'
 import * as vscode from 'vscode'
-import HtmlDocumentContentProvider from './HtmlDocumentContentProvider'
+import HtmlDocumentContentProvider from './HTMLDocumentContentProvider'
 import pyGuiLibraryIsPresent from './pyGuiLibraryIsPresent'
 import {PythonEvaluator} from 'arepl-backend'
 
diff --git a/src/extension.ts b/src/extension.ts
index 3c0ef93..a5af0fb 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -1,8 +1,8 @@
 'use strict';
 import * as vscode from 'vscode';
-import Utilities from './Utilities';
+import Utilities from './utilities';
 import PreviewManager from './PreviewManager'
-import pythonPreviewContentProvider from './htmlDocumentContentProvider';
+import pythonPreviewContentProvider from './HTMLDocumentContentProvider';
 
 export function activate(context: vscode.ExtensionContext) {
     // Register the commands that are provided to the user