diff --git a/spring-messaging/src/main/java/org/springframework/messaging/simp/broker/DefaultSubscriptionRegistry.java b/spring-messaging/src/main/java/org/springframework/messaging/simp/broker/DefaultSubscriptionRegistry.java
index 76b4b8f1e66..1772350e3de 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/simp/broker/DefaultSubscriptionRegistry.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/simp/broker/DefaultSubscriptionRegistry.java
@@ -74,7 +74,8 @@ public class DefaultSubscriptionRegistry extends AbstractSubscriptionRegistry {
 
 	/** Static evaluation context to reuse. */
 	private static final EvaluationContext messageEvalContext =
-			SimpleEvaluationContext.forPropertyAccessors(new SimpMessageHeaderPropertyAccessor()).build();
+			SimpleEvaluationContext.forPropertyAccessors(new SimpMessageHeaderPropertyAccessor())
+					.withAssignmentDisabled().build();
 
 
 	private PathMatcher pathMatcher = new AntPathMatcher();