diff --git a/test/smoke/test/index.js b/test/smoke/test/index.js
index 346d0c1371..a0e63f46ba 100644
--- a/test/smoke/test/index.js
+++ b/test/smoke/test/index.js
@@ -33,8 +33,6 @@ if (process.env.BUILD_ARTIFACTSTAGINGDIRECTORY) {
 	};
 }
 
-const mocha = new Mocha(options);
-
 // {{SQL CARBON EDIT}} - If grep option is specified, only run the matching test cases (local test case development/debug scenario),
 // otherwise the value of 'RUN_UNSTABLE_TESTS' environment variable will be used to determine whether to run the stable test cases or the whole test suite.
 // Unstable test cases have "@UNSTABLE@" in their full name (test suite name + test name).
@@ -43,12 +41,15 @@ if (!options.grep) {
 		console.info('running all test cases.');
 	} else {
 		console.info('running stable test cases.');
-		mocha.grep('@UNSTABLE@').invert();
+		options.grep= '@UNSTABLE@';
+		options.invert = true;
 	}
 } else {
 	console.info('running test cases match the grep option.');
 }
 // {{SQL CARBON EDIT}} - end of edit.
 
+const mocha = new Mocha(options);
+
 mocha.addFile('out/main.js');
 mocha.run(failures => process.exit(failures ? -1 : 0));