diff --git a/src/vs/workbench/api/browser/mainThreadEditors.ts b/src/vs/workbench/api/browser/mainThreadEditors.ts
index adfd675a463..738493d397d 100644
--- a/src/vs/workbench/api/browser/mainThreadEditors.ts
+++ b/src/vs/workbench/api/browser/mainThreadEditors.ts
@@ -3,7 +3,6 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
-import { localize } from 'vs/nls';
 import { disposed } from 'vs/base/common/errors';
 import { IDisposable, dispose, DisposableStore } from 'vs/base/common/lifecycle';
 import { equals as objectEquals } from 'vs/base/common/objects';
@@ -348,10 +347,6 @@ CommandsRegistry.registerCommand('_workbench.diff', async function (accessor: Se
 		};
 	}
 
-	if (!label) {
-		label = localize('diffLeftRightLabel', "{0} ⟷ {1}", leftResource.toString(true), rightResource.toString(true));
-	}
-
 	await editorService.openEditor({ leftResource, rightResource, label, description, options }, viewColumnToEditorGroup(editorGroupService, position));
 });
 
diff --git a/src/vs/workbench/services/editor/browser/editorService.ts b/src/vs/workbench/services/editor/browser/editorService.ts
index 02bdd13b06d..b0b177e0aca 100644
--- a/src/vs/workbench/services/editor/browser/editorService.ts
+++ b/src/vs/workbench/services/editor/browser/editorService.ts
@@ -818,7 +818,7 @@ export class EditorService extends Disposable implements EditorServiceImpl {
 			const rightInput = this.createEditorInput({ resource: resourceDiffInput.rightResource, forceFile: resourceDiffInput.forceFile });
 
 			return new DiffEditorInput(
-				resourceDiffInput.label || this.toSideBySideLabel(leftInput, rightInput, '↔'),
+				resourceDiffInput.label || this.toSideBySideLabel(leftInput, rightInput),
 				resourceDiffInput.description,
 				leftInput,
 				rightInput
@@ -968,18 +968,13 @@ export class EditorService extends Disposable implements EditorServiceImpl {
 		return input;
 	}
 
-	private toSideBySideLabel(leftInput: EditorInput, rightInput: EditorInput, divider: string): string | undefined {
-
-		// Without any resource, do not try to compute a label
-		if (!leftInput.resource || !rightInput.resource) {
-			return undefined;
-		}
+	private toSideBySideLabel(leftInput: EditorInput, rightInput: EditorInput): string | undefined {
 
 		// If both editors are file inputs, we produce an optimized label
 		// by adding the relative path of both inputs to the label. This
 		// makes it easier to understand a file-based comparison.
 		if (this.fileEditorInputFactory.isFileEditorInput(leftInput) && this.fileEditorInputFactory.isFileEditorInput(rightInput)) {
-			return `${this.labelService.getUriLabel(leftInput.preferredResource, { relative: true })} ${divider} ${this.labelService.getUriLabel(rightInput.preferredResource, { relative: true })}`;
+			return `${this.labelService.getUriLabel(leftInput.preferredResource, { relative: true })} ↔ ${this.labelService.getUriLabel(rightInput.preferredResource, { relative: true })}`;
 		}
 
 		// Signal back that the label should be computed from within the editor