diff --git a/extensions/typescript-language-features/src/protocol.d.ts b/extensions/typescript-language-features/src/protocol.d.ts
index 6e926eb8d7e..5652967abfc 100644
--- a/extensions/typescript-language-features/src/protocol.d.ts
+++ b/extensions/typescript-language-features/src/protocol.d.ts
@@ -1,2 +1,11 @@
 import * as Proto from 'typescript/lib/protocol';
 export = Proto;
+
+declare module "typescript/lib/protocol" {
+	// TODO: Remove this hardcoded type once we update to TS 3.8+ that brings in the proper types
+	interface Response {
+		performanceData?: {
+			updateGraphDurationMs?: number;
+		}
+	}
+}