diff --git a/src/SignalR/clients/ts/FunctionalTests/scripts/karma.base.conf.js b/src/SignalR/clients/ts/FunctionalTests/scripts/karma.base.conf.js
index f466841a5e..a9599ea0d8 100644
--- a/src/SignalR/clients/ts/FunctionalTests/scripts/karma.base.conf.js
+++ b/src/SignalR/clients/ts/FunctionalTests/scripts/karma.base.conf.js
@@ -26,7 +26,7 @@ try {
                 logLevel: config.LOG_INFO,
                 autoWatch: false,
                 singleRun: false,
-                concurrency: Infinity,
+                concurrency: 1,
 
                 // Log browser messages to a file, not the terminal.
                 browserConsoleLogOptions: {