diff --git a/karma.conf.js b/karma.conf.js
index 2cfe0925f..f91ef3008 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -29,7 +29,8 @@ module.exports = config => {
     frameworks: ['mocha', 'sinon-chai'],
     colors: true,
     reporters: ['mocha', 'coverage'],
-
+    // https://github.com/karma-runner/karma/blob/master/docs/config/01-configuration-file.md#browsernoactivitytimeout
+    browserNoActivityTimeout: 20000,
     logLevel: config.LOG_INFO,
     preprocessors: {
       'test/*.js': ['webpack']