diff --git a/src/vs/workbench/browser/parts/titlebar/titlebarPart.ts b/src/vs/workbench/browser/parts/titlebar/titlebarPart.ts
index fd748603dc6..9a3ec23a52f 100644
--- a/src/vs/workbench/browser/parts/titlebar/titlebarPart.ts
+++ b/src/vs/workbench/browser/parts/titlebar/titlebarPart.ts
@@ -33,6 +33,7 @@ import { IThemeService } from 'vs/platform/theme/common/themeService';
 import { TITLE_BAR_ACTIVE_BACKGROUND, TITLE_BAR_ACTIVE_FOREGROUND, TITLE_BAR_INACTIVE_FOREGROUND, TITLE_BAR_INACTIVE_BACKGROUND, TITLE_BAR_BORDER } from 'vs/workbench/common/theme';
 import { IPartService } from 'vs/workbench/services/part/common/partService';
 import { isMacintosh } from 'vs/base/common/platform';
+import URI from 'vs/base/common/uri';
 
 export class TitlebarPart extends Part implements ITitleService {
 
@@ -178,7 +179,7 @@ export class TitlebarPart extends Part implements ITitleService {
 		const input = this.editorService.getActiveEditorInput();
 		const workspace = this.contextService.getWorkspace();
 
-		let root;
+		let root: URI;
 		if (workspace.configuration) {
 			root = workspace.configuration;
 		} else if (workspace.folders.length) {