diff --git a/build/gulpfile.extensions.js b/build/gulpfile.extensions.js
index 83d4f32179f..687bd16fd8c 100644
--- a/build/gulpfile.extensions.js
+++ b/build/gulpfile.extensions.js
@@ -47,7 +47,6 @@ const compilations = [
 	'extensions/jake/tsconfig.json',
 	'extensions/json-language-features/client/tsconfig.json',
 	'extensions/json-language-features/server/tsconfig.json',
-	'extensions/markdown-language-features/preview-src/tsconfig.json',
 	'extensions/markdown-language-features/tsconfig.json',
 	'extensions/markdown-math/tsconfig.json',
 	'extensions/media-preview/tsconfig.json',
@@ -61,7 +60,6 @@ const compilations = [
 	'extensions/search-result/tsconfig.json',
 	'extensions/simple-browser/tsconfig.json',
 	'extensions/tunnel-forwarding/tsconfig.json',
-	'extensions/typescript-language-features/test-workspace/tsconfig.json',
 	'extensions/typescript-language-features/web/tsconfig.json',
 	'extensions/typescript-language-features/tsconfig.json',
 	'extensions/vscode-api-tests/tsconfig.json',