diff --git a/extensions/html-language-features/server/package.json b/extensions/html-language-features/server/package.json
index 14dbc1ca7c3..efb68785974 100644
--- a/extensions/html-language-features/server/package.json
+++ b/extensions/html-language-features/server/package.json
@@ -11,6 +11,7 @@
   "dependencies": {
     "vscode-css-languageservice": "^5.1.0",
     "vscode-html-languageservice": "^4.0.2",
+    "vscode-languageserver-textdocument": "^1.0.1",
     "vscode-languageserver": "^7.0.0",
     "vscode-nls": "^5.0.0",
     "vscode-uri": "^3.0.2"