diff --git a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
index 30fcbb79938..64a3f19a3be 100644
--- a/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
+++ b/src/vs/workbench/api/browser/mainThreadLanguageFeatures.ts
@@ -441,10 +441,10 @@ export class MainThreadLanguageFeatures implements MainThreadLanguageFeaturesSha
 		};
 	}
 
-	$registerSuggestSupport(handle: number, selector: IDocumentFilterDto[], triggerCharacters: string[], supportsResolveDetails: boolean, extensionId: ExtensionIdentifier): void {
+	$registerSuggestSupport(handle: number, selector: IDocumentFilterDto[], triggerCharacters: string[], supportsResolveDetails: boolean, displayName: string): void {
 		const provider: modes.CompletionItemProvider = {
 			triggerCharacters,
-			_debugDisplayName: extensionId.value,
+			_debugDisplayName: displayName,
 			provideCompletionItems: async (model: ITextModel, position: EditorPosition, context: modes.CompletionContext, token: CancellationToken): Promise<modes.CompletionList | undefined> => {
 				const result = await this._proxy.$provideCompletionItems(handle, model.uri, position, context, token);
 				if (!result) {
diff --git a/src/vs/workbench/api/common/extHost.protocol.ts b/src/vs/workbench/api/common/extHost.protocol.ts
index 22d1885b8bd..bbb93b68860 100644
--- a/src/vs/workbench/api/common/extHost.protocol.ts
+++ b/src/vs/workbench/api/common/extHost.protocol.ts
@@ -394,7 +394,7 @@ export interface MainThreadLanguageFeaturesShape extends IDisposable {
 	$registerDocumentSemanticTokensProvider(handle: number, selector: IDocumentFilterDto[], legend: modes.SemanticTokensLegend, eventHandle: number | undefined): void;
 	$emitDocumentSemanticTokensEvent(eventHandle: number): void;
 	$registerDocumentRangeSemanticTokensProvider(handle: number, selector: IDocumentFilterDto[], legend: modes.SemanticTokensLegend): void;
-	$registerSuggestSupport(handle: number, selector: IDocumentFilterDto[], triggerCharacters: string[], supportsResolveDetails: boolean, extensionId: ExtensionIdentifier): void;
+	$registerSuggestSupport(handle: number, selector: IDocumentFilterDto[], triggerCharacters: string[], supportsResolveDetails: boolean, displayName: string): void;
 	$registerSignatureHelpProvider(handle: number, selector: IDocumentFilterDto[], metadata: ISignatureHelpProviderMetadataDto): void;
 	$registerDocumentLinkProvider(handle: number, selector: IDocumentFilterDto[], supportsResolve: boolean): void;
 	$registerDocumentColorProvider(handle: number, selector: IDocumentFilterDto[]): void;
diff --git a/src/vs/workbench/api/common/extHostLanguageFeatures.ts b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
index e3ac4d5ee41..19592d3f92e 100644
--- a/src/vs/workbench/api/common/extHostLanguageFeatures.ts
+++ b/src/vs/workbench/api/common/extHostLanguageFeatures.ts
@@ -1743,7 +1743,7 @@ export class ExtHostLanguageFeatures implements extHostProtocol.ExtHostLanguageF
 
 	registerCompletionItemProvider(extension: IExtensionDescription, selector: vscode.DocumentSelector, provider: vscode.CompletionItemProvider, triggerCharacters: string[]): vscode.Disposable {
 		const handle = this._addNewAdapter(new SuggestAdapter(this._documents, this._commands.converter, provider, this._apiDeprecation, extension), extension);
-		this._proxy.$registerSuggestSupport(handle, this._transformDocumentSelector(selector), triggerCharacters, SuggestAdapter.supportsResolving(provider), extension.identifier);
+		this._proxy.$registerSuggestSupport(handle, this._transformDocumentSelector(selector), triggerCharacters, SuggestAdapter.supportsResolving(provider), `${extension.identifier.value}/${triggerCharacters.join()}`);
 		return this._createDisposable(handle);
 	}