diff --git a/src/vs/workbench/browser/parts/editor/editorActions.ts b/src/vs/workbench/browser/parts/editor/editorActions.ts
index 81e001915bb18..ae87fa3a82a9c 100644
--- a/src/vs/workbench/browser/parts/editor/editorActions.ts
+++ b/src/vs/workbench/browser/parts/editor/editorActions.ts
@@ -9,7 +9,7 @@ import nls = require('vs/nls');
 import { Action } from 'vs/base/common/actions';
 import { mixin } from 'vs/base/common/objects';
 import { getCodeEditor } from 'vs/editor/browser/services/codeEditorService';
-import { EditorInput, TextEditorOptions, EditorOptions, IEditorIdentifier, ActiveEditorMoveArguments, ActiveEditorMovePositioning, EditorCommands, ConfirmResult } from 'vs/workbench/common/editor';
+import { EditorInput, TextEditorOptions, EditorOptions, IEditorIdentifier, ActiveEditorMoveArguments, ActiveEditorMovePositioning, EditorCommands, ConfirmResult, IEditorCommandsContext } from 'vs/workbench/common/editor';
 import { QuickOpenEntryGroup } from 'vs/base/parts/quickopen/browser/quickOpenModel';
 import { EditorQuickOpenEntry, EditorQuickOpenEntryGroup, IEditorQuickOpenEntry, QuickOpenAction } from 'vs/workbench/browser/quickopen';
 import { IWorkbenchEditorService } from 'vs/workbench/services/editor/common/editorService';
@@ -38,10 +38,11 @@ export class SplitEditorAction extends Action {
 		super(id, label, 'split-editor-action');
 	}
 
-	public run(context?: IEditorIdentifier): TPromise<any> {
+	public run(context?: IEditorCommandsContext): TPromise<any> {
 		let editorToSplit: IEditor;
 		if (context) {
-			editorToSplit = this.editorService.getVisibleEditors()[this.editorGroupService.getStacksModel().positionOfGroup(context.group)];
+			const stacks = this.editorGroupService.getStacksModel();
+			editorToSplit = this.editorService.getVisibleEditors()[stacks.positionOfGroup(stacks.getGroup(context.groupId))];
 		} else {
 			editorToSplit = this.editorService.getActiveEditor();
 		}