diff --git a/Extension/src/LanguageServer/extension.ts b/Extension/src/LanguageServer/extension.ts
index 6f2a408a58..3acbc9eff7 100644
--- a/Extension/src/LanguageServer/extension.ts
+++ b/Extension/src/LanguageServer/extension.ts
@@ -276,6 +276,9 @@ function sendActivationTelemetry(): void {
         }
         machineIdPersistentState.Value = vscode.env.machineId;
     }
+    if (vscode.env.uiKind === vscode.UIKind.Web) {
+        activateEvent["WebUI"] = "1";
+    }
     telemetry.logLanguageServerEvent("Activate", activateEvent);
 }