diff --git a/src/tsconfig.strictNullChecks.json b/src/tsconfig.strictNullChecks.json
index 2c63fc51cc7..fa5c3b6932a 100644
--- a/src/tsconfig.strictNullChecks.json
+++ b/src/tsconfig.strictNullChecks.json
@@ -114,6 +114,7 @@
 		"./vs/workbench/api/node/extHostQuickOpen.ts",
 		"./vs/workbench/api/node/extHostSCM.ts",
 		"./vs/workbench/api/node/extHostSearch.ts",
+		"./vs/workbench/api/node/extHostStatusBar.ts",
 		"./vs/workbench/api/node/extHostStorage.ts",
 		"./vs/workbench/api/node/extHostTextEditor.ts",
 		"./vs/workbench/api/node/extHostTextEditors.ts",
diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 1b773f2da31..4c0ad9937a9 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -4517,7 +4517,7 @@ declare module 'vscode' {
 		 * The priority of this item. Higher value means the item should
 		 * be shown more to the left.
 		 */
-		readonly priority: number;
+		readonly priority?: number;
 
 		/**
 		 * The text to show for the entry. You can embed icons in the text by leveraging the syntax:
diff --git a/src/vs/workbench/api/node/extHost.protocol.ts b/src/vs/workbench/api/node/extHost.protocol.ts
index 00eb6e73112..15a16ca11cc 100644
--- a/src/vs/workbench/api/node/extHost.protocol.ts
+++ b/src/vs/workbench/api/node/extHost.protocol.ts
@@ -466,7 +466,7 @@ export interface MainThreadQuickOpenShape extends IDisposable {
 }
 
 export interface MainThreadStatusBarShape extends IDisposable {
-	$setEntry(id: number, extensionId: ExtensionIdentifier, text: string, tooltip: string, command: string, color: string | ThemeColor, alignment: MainThreadStatusBarAlignment, priority: number): void;
+	$setEntry(id: number, extensionId: ExtensionIdentifier | undefined, text: string, tooltip: string, command: string, color: string | ThemeColor, alignment: MainThreadStatusBarAlignment, priority: number | undefined): void;
 	$dispose(id: number): void;
 }
 
diff --git a/src/vs/workbench/api/node/extHostStatusBar.ts b/src/vs/workbench/api/node/extHostStatusBar.ts
index cd6c2066146..bc7215c0fe9 100644
--- a/src/vs/workbench/api/node/extHostStatusBar.ts
+++ b/src/vs/workbench/api/node/extHostStatusBar.ts
@@ -14,7 +14,7 @@ export class ExtHostStatusBarEntry implements StatusBarItem {
 
 	private _id: number;
 	private _alignment: number;
-	private _priority: number;
+	private _priority?: number;
 	private _disposed: boolean;
 	private _visible: boolean;
 
@@ -26,9 +26,9 @@ export class ExtHostStatusBarEntry implements StatusBarItem {
 	private _timeoutHandle: any;
 	private _proxy: MainThreadStatusBarShape;
 
-	private _extensionId: ExtensionIdentifier;
+	private _extensionId?: ExtensionIdentifier;
 
-	constructor(proxy: MainThreadStatusBarShape, extensionId: ExtensionIdentifier, alignment: ExtHostStatusBarAlignment = ExtHostStatusBarAlignment.Left, priority?: number) {
+	constructor(proxy: MainThreadStatusBarShape, extensionId: ExtensionIdentifier | undefined, alignment: ExtHostStatusBarAlignment = ExtHostStatusBarAlignment.Left, priority?: number) {
 		this._id = ExtHostStatusBarEntry.ID_GEN++;
 		this._proxy = proxy;
 		this._alignment = alignment;
@@ -44,7 +44,7 @@ export class ExtHostStatusBarEntry implements StatusBarItem {
 		return this._alignment;
 	}
 
-	public get priority(): number {
+	public get priority(): number | undefined {
 		return this._priority;
 	}
 
@@ -167,7 +167,7 @@ export class ExtHostStatusBar {
 		this._statusMessage = new StatusBarMessage(this);
 	}
 
-	createStatusBarEntry(extensionId: ExtensionIdentifier, alignment?: ExtHostStatusBarAlignment, priority?: number): StatusBarItem {
+	createStatusBarEntry(extensionId: ExtensionIdentifier | undefined, alignment?: ExtHostStatusBarAlignment, priority?: number): StatusBarItem {
 		return new ExtHostStatusBarEntry(this._proxy, extensionId, alignment, priority);
 	}