diff --git a/application/src/test/java/org/thingsboard/server/controller/AbstractControllerTest.java b/application/src/test/java/org/thingsboard/server/controller/AbstractControllerTest.java
index 06cee7b71d..32d1f65765 100644
--- a/application/src/test/java/org/thingsboard/server/controller/AbstractControllerTest.java
+++ b/application/src/test/java/org/thingsboard/server/controller/AbstractControllerTest.java
@@ -52,7 +52,7 @@ public abstract class AbstractControllerTest extends AbstractNotifyEntityTest {
     @LocalServerPort
     protected int wsPort;
 
-    private TbTestWebSocketClient wsClient; // lazy
+    private volatile TbTestWebSocketClient wsClient; // lazy
 
     public TbTestWebSocketClient getWsClient() {
         if (wsClient == null) {