diff --git a/src/vs/editor/common/modes.ts b/src/vs/editor/common/modes.ts
index 419759fbf32..f3c6d995363 100644
--- a/src/vs/editor/common/modes.ts
+++ b/src/vs/editor/common/modes.ts
@@ -191,7 +191,6 @@ export interface ISuggestion {
 	additionalTextEdits?: editorCommon.ISingleEditOperation[];
 	command?: Command;
 	snippetType?: SnippetType;
-	_extensionId?: string;
 }
 
 /**
diff --git a/src/vs/editor/contrib/suggest/browser/suggestController.ts b/src/vs/editor/contrib/suggest/browser/suggestController.ts
index 9b36f080e7d..770663c78ea 100644
--- a/src/vs/editor/contrib/suggest/browser/suggestController.ts
+++ b/src/vs/editor/contrib/suggest/browser/suggestController.ts
@@ -111,17 +111,6 @@ export class SuggestController implements IEditorContribution {
 				this.telemetryService.publicLog('suggestSnippetInsert', {
 					hasPlaceholders: snippet.placeHolders.length > 0
 				});
-
-				// telemetry experiment to figure out which extensions use
-				// the internal snippet syntax today and which use the tm
-				// snippet syntax (by accident?)
-				if (suggestion._extensionId) {
-					this.telemetryService.publicLog('suggestSnippetInsert2', {
-						extension: suggestion._extensionId,
-						internalPlaceholders: snippet.placeHolders.length,
-						tmPlaceholders: CodeSnippet.fromTextmate(suggestion.insertText).placeHolders.length
-					});
-				}
 			}
 		}
 
diff --git a/src/vs/workbench/api/node/extHost.api.impl.ts b/src/vs/workbench/api/node/extHost.api.impl.ts
index e7ee3be9ea0..be5a2dfb6b0 100644
--- a/src/vs/workbench/api/node/extHost.api.impl.ts
+++ b/src/vs/workbench/api/node/extHost.api.impl.ts
@@ -211,7 +211,7 @@ export function createApiFactory(initData: IInitData, threadService: IThreadServ
 				return languageFeatures.registerSignatureHelpProvider(selector, provider, triggerCharacters);
 			},
 			registerCompletionItemProvider(selector: vscode.DocumentSelector, provider: vscode.CompletionItemProvider, ...triggerCharacters: string[]): vscode.Disposable {
-				return languageFeatures.registerCompletionItemProvider(selector, provider, triggerCharacters, extension);
+				return languageFeatures.registerCompletionItemProvider(selector, provider, triggerCharacters);
 			},
 			registerDocumentLinkProvider(selector: vscode.DocumentSelector, provider: vscode.DocumentLinkProvider): vscode.Disposable {
 				return languageFeatures.registerDocumentLinkProvider(selector, provider);
diff --git a/src/vs/workbench/api/node/extHostLanguageFeatures.ts b/src/vs/workbench/api/node/extHostLanguageFeatures.ts
index c872dadf205..dfce64cc6fb 100644
--- a/src/vs/workbench/api/node/extHostLanguageFeatures.ts
+++ b/src/vs/workbench/api/node/extHostLanguageFeatures.ts
@@ -21,7 +21,6 @@ import { IWorkspaceSymbolProvider, IWorkspaceSymbol } from 'vs/workbench/parts/s
 import { asWinJsPromise } from 'vs/base/common/async';
 import { MainContext, MainThreadLanguageFeaturesShape, ExtHostLanguageFeaturesShape, ObjectIdentifier } from './extHost.protocol';
 import { regExpLeadsToEndlessLoop } from 'vs/base/common/strings';
-import { IExtensionDescription } from 'vs/platform/extensions/common/extensions';
 
 // --- adapter
 
@@ -414,14 +413,12 @@ class SuggestAdapter {
 	private _commands: CommandsConverter;
 	private _heapService: ExtHostHeapService;
 	private _provider: vscode.CompletionItemProvider;
-	private _extension: IExtensionDescription;
 
-	constructor(documents: ExtHostDocuments, commands: CommandsConverter, heapService: ExtHostHeapService, provider: vscode.CompletionItemProvider, extension?: IExtensionDescription) {
+	constructor(documents: ExtHostDocuments, commands: CommandsConverter, heapService: ExtHostHeapService, provider: vscode.CompletionItemProvider) {
 		this._documents = documents;
 		this._commands = commands;
 		this._heapService = heapService;
 		this._provider = provider;
-		this._extension = extension;
 	}
 
 	provideCompletionItems(resource: URI, position: IPosition): TPromise<modes.ISuggestResult> {
@@ -825,9 +822,9 @@ export class ExtHostLanguageFeatures extends ExtHostLanguageFeaturesShape {
 
 	// --- suggestion
 
-	registerCompletionItemProvider(selector: vscode.DocumentSelector, provider: vscode.CompletionItemProvider, triggerCharacters: string[], extension?: IExtensionDescription): vscode.Disposable {
+	registerCompletionItemProvider(selector: vscode.DocumentSelector, provider: vscode.CompletionItemProvider, triggerCharacters: string[]): vscode.Disposable {
 		const handle = this._nextHandle();
-		this._adapter[handle] = new SuggestAdapter(this._documents, this._commands.converter, this._heapService, provider, extension);
+		this._adapter[handle] = new SuggestAdapter(this._documents, this._commands.converter, this._heapService, provider);
 		this._proxy.$registerSuggestSupport(handle, selector, triggerCharacters);
 		return this._createDisposable(handle);
 	}