diff --git a/src/vs/workbench/contrib/terminalContrib/chatAgentTools/test/browser/terminalSandboxService.test.ts b/src/vs/workbench/contrib/terminalContrib/chatAgentTools/test/browser/terminalSandboxService.test.ts
index d1be92c4880..3b5f156b3c0 100644
--- a/src/vs/workbench/contrib/terminalContrib/chatAgentTools/test/browser/terminalSandboxService.test.ts
+++ b/src/vs/workbench/contrib/terminalContrib/chatAgentTools/test/browser/terminalSandboxService.test.ts
@@ -71,6 +71,7 @@ suite('TerminalSandboxService - allowTrustedDomains', () => {
 		instantiationService.stub(IConfigurationService, configurationService);
 		instantiationService.stub(IFileService, fileService);
 		instantiationService.stub(IEnvironmentService, <IEnvironmentService & { tmpDir?: URI; execPath?: string }>{
+			_serviceBrand: undefined,
 			tmpDir: URI.file('/tmp'),
 			execPath: '/usr/bin/node'
 		});