diff --git a/src/vs/workbench/api/browser/mainThreadSCM.ts b/src/vs/workbench/api/browser/mainThreadSCM.ts
index 926cc4d8286..d8d861b8bb7 100644
--- a/src/vs/workbench/api/browser/mainThreadSCM.ts
+++ b/src/vs/workbench/api/browser/mainThreadSCM.ts
@@ -288,7 +288,7 @@ export class MainThreadSCM implements MainThreadSCMShape {
 	}
 
 	$registerSourceControl(handle: number, id: string, label: string, rootUri: UriComponents | undefined): void {
-		const provider = new MainThreadSCMProvider(this._proxy, handle, id, label, rootUri && URI.revive(rootUri), this.scmService);
+		const provider = new MainThreadSCMProvider(this._proxy, handle, id, label, rootUri ? URI.revive(rootUri) : undefined, this.scmService);
 		const repository = this.scmService.registerSCMProvider(provider);
 		this._repositories.set(handle, repository);