diff --git a/extensions/vscode-api-tests/package.json b/extensions/vscode-api-tests/package.json
index 93ac38acad8aaac1604d951dea2c1c01ed5aecec..1b3e93e88ec48103d0e10d335c399b57ca40e168 100644
--- a/extensions/vscode-api-tests/package.json
+++ b/extensions/vscode-api-tests/package.json
@@ -3,6 +3,7 @@
 	"description": "API tests for VS Code",
 	"version": "0.0.1",
 	"publisher": "vscode",
+	"enableProposedApi": true,
 	"private": true,
 	"engines": {
 		"vscode": "*"