diff --git a/src/vs/editor/common/model/editStack.ts b/src/vs/editor/common/model/editStack.ts
index 93eccea6b5f..24c38f88141 100644
--- a/src/vs/editor/common/model/editStack.ts
+++ b/src/vs/editor/common/model/editStack.ts
@@ -10,10 +10,13 @@ import { EndOfLineSequence, ICursorStateComputer, IIdentifiedSingleEditOperation
 import { TextModel } from 'vs/editor/common/model/textModel';
 import { IUndoRedoService, IResourceUndoRedoElement, UndoRedoElementType, IWorkspaceUndoRedoElement } from 'vs/platform/undoRedo/common/undoRedo';
 import { URI } from 'vs/base/common/uri';
-import { getComparisonKey as uriGetComparisonKey } from 'vs/base/common/resources';
 import { TextChange, compressConsecutiveTextChanges } from 'vs/editor/common/model/textChange';
 import * as buffer from 'vs/base/common/buffer';
 
+function uriGetComparisonKey(resource: URI): string {
+	return resource.toString();
+}
+
 class SingleModelEditStackData {
 
 	public static create(model: ITextModel, beforeCursorState: Selection[] | null): SingleModelEditStackData {
diff --git a/src/vs/platform/undoRedo/common/undoRedoService.ts b/src/vs/platform/undoRedo/common/undoRedoService.ts
index 65c9382526e..9858c9eb6af 100644
--- a/src/vs/platform/undoRedo/common/undoRedoService.ts
+++ b/src/vs/platform/undoRedo/common/undoRedoService.ts
@@ -6,7 +6,6 @@
 import * as nls from 'vs/nls';
 import { IUndoRedoService, IResourceUndoRedoElement, IWorkspaceUndoRedoElement, UndoRedoElementType, IUndoRedoElement, IPastFutureElements } from 'vs/platform/undoRedo/common/undoRedo';
 import { URI } from 'vs/base/common/uri';
-import { getComparisonKey as uriGetComparisonKey } from 'vs/base/common/resources';
 import { onUnexpectedError } from 'vs/base/common/errors';
 import { registerSingleton } from 'vs/platform/instantiation/common/extensions';
 import { IDialogService } from 'vs/platform/dialogs/common/dialogs';
@@ -14,6 +13,10 @@ import Severity from 'vs/base/common/severity';
 import { Schemas } from 'vs/base/common/network';
 import { INotificationService } from 'vs/platform/notification/common/notification';
 
+function uriGetComparisonKey(resource: URI): string {
+	return resource.toString();
+}
+
 class ResourceStackElement {
 	public readonly type = UndoRedoElementType.Resource;
 	public readonly actual: IResourceUndoRedoElement;