diff --git a/karma.conf.js b/karma.conf.js
index 480d769de4f..85ec5069848 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -96,7 +96,7 @@ module.exports = function (config, base, karmaTypescriptConfig) {
         },
         coverageOptions: {
           instrumentation: !isDebug,
-          exclude: /(\.test)|(spec\.ts$)/,
+          exclude: /\.(test|spec)\.ts$/,
         },
         reports: {
           html: reportsDir,