diff --git a/src/vs/workbench/api/node/extHost.protocol.ts b/src/vs/workbench/api/node/extHost.protocol.ts
index 8813c2da060..fe0a73be762 100644
--- a/src/vs/workbench/api/node/extHost.protocol.ts
+++ b/src/vs/workbench/api/node/extHost.protocol.ts
@@ -231,7 +231,7 @@ export abstract class ExtHostDocumentsShape {
 	$acceptModelDirty(strURL: string): void { throw ni(); }
 	$acceptModelReverted(strURL: string): void { throw ni(); }
 	$acceptModelRemoved(strURL: string): void { throw ni(); }
-	$acceptModelChanged(strURL: string, events: editorCommon.IModelContentChangedEvent2[]): void { throw ni(); }
+	$acceptModelChanged(strURL: string, events: editorCommon.IModelContentChangedEvent2[], isDirty: boolean): void { throw ni(); }
 }
 
 export abstract class ExtHostDocumentSaveParticipantShape {
diff --git a/src/vs/workbench/api/node/extHostDocuments.ts b/src/vs/workbench/api/node/extHostDocuments.ts
index 2216b8cf4a9..8f7b18db3ff 100644
--- a/src/vs/workbench/api/node/extHostDocuments.ts
+++ b/src/vs/workbench/api/node/extHostDocuments.ts
@@ -199,8 +199,9 @@ export class ExtHostDocuments extends ExtHostDocumentsShape {
 		data.dispose();
 	}
 
-	public $acceptModelChanged(strURL: string, events: editorCommon.IModelContentChangedEvent2[]): void {
+	public $acceptModelChanged(strURL: string, events: editorCommon.IModelContentChangedEvent2[], isDirty: boolean): void {
 		let data = this._documentData[strURL];
+		data._acceptIsDirty(isDirty);
 		data.onEvents(events);
 		this._onDidChangeDocumentEventEmitter.fire({
 			document: data.document,
diff --git a/src/vs/workbench/api/node/mainThreadDocuments.ts b/src/vs/workbench/api/node/mainThreadDocuments.ts
index b39faff7845..eb25df0e6d4 100644
--- a/src/vs/workbench/api/node/mainThreadDocuments.ts
+++ b/src/vs/workbench/api/node/mainThreadDocuments.ts
@@ -147,7 +147,7 @@ export class MainThreadDocuments extends MainThreadDocumentsShape {
 			}
 		}
 		if (changedEvents.length > 0) {
-			this._proxy.$acceptModelChanged(modelUrl.toString(), changedEvents);
+			this._proxy.$acceptModelChanged(modelUrl.toString(), changedEvents, this._textFileService.isDirty(modelUrl));
 		}
 	}