diff --git a/spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/server/upgrade/JettyRequestUpgradeStrategy.java b/spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/server/upgrade/JettyRequestUpgradeStrategy.java
index 35e17658da..2c95112eb6 100644
--- a/spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/server/upgrade/JettyRequestUpgradeStrategy.java
+++ b/spring-web-reactive/src/main/java/org/springframework/web/reactive/socket/server/upgrade/JettyRequestUpgradeStrategy.java
@@ -56,7 +56,7 @@ public class JettyRequestUpgradeStrategy implements RequestUpgradeStrategy, Life
 
 	private WebSocketServerFactory factory;
 
-	private ServletContext servletContext;
+	private volatile ServletContext servletContext;
 
 	private volatile boolean running = false;