diff --git a/extensions/typescript-language-features/src/protocol.d.ts b/extensions/typescript-language-features/src/protocol.d.ts
index 62d6c4793ca..6e926eb8d7e 100644
--- a/extensions/typescript-language-features/src/protocol.d.ts
+++ b/extensions/typescript-language-features/src/protocol.d.ts
@@ -1,61 +1,2 @@
 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;
-		}
-	}
-
-	const enum CommandTypes {
-		PrepareCallHierarchy = "prepareCallHierarchy",
-		ProvideCallHierarchyIncomingCalls = "provideCallHierarchyIncomingCalls",
-		ProvideCallHierarchyOutgoingCalls = "provideCallHierarchyOutgoingCalls",
-	}
-
-	interface CallHierarchyItem {
-		name: string;
-		kind: ScriptElementKind;
-		file: string;
-		span: TextSpan;
-		selectionSpan: TextSpan;
-	}
-
-	interface CallHierarchyIncomingCall {
-		from: CallHierarchyItem;
-		fromSpans: TextSpan[];
-	}
-
-	interface CallHierarchyOutgoingCall {
-		to: CallHierarchyItem;
-		fromSpans: TextSpan[];
-	}
-
-	interface PrepareCallHierarchyRequest extends FileLocationRequest {
-		command: CommandTypes.PrepareCallHierarchy;
-	}
-
-	interface PrepareCallHierarchyResponse extends Response {
-		readonly body: CallHierarchyItem | CallHierarchyItem[];
-	}
-
-	interface ProvideCallHierarchyIncomingCallsRequest extends FileLocationRequest {
-		command: CommandTypes.ProvideCallHierarchyIncomingCalls;
-		kind: ScriptElementKind;
-	}
-
-	interface ProvideCallHierarchyIncomingCallsResponse extends Response {
-		readonly body: CallHierarchyIncomingCall[];
-	}
-
-	interface ProvideCallHierarchyOutgoingCallsRequest extends FileLocationRequest {
-		command: CommandTypes.ProvideCallHierarchyOutgoingCalls;
-		kind: ScriptElementKind;
-	}
-
-	interface ProvideCallHierarchyOutgoingCallsResponse extends Response {
-		readonly body: CallHierarchyOutgoingCall[];
-	}
-}