diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/adapter/JettyWebSocketSession.java b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/adapter/JettyWebSocketSession.java
index 33e8d9cefcfc..84f6d056ec5c 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/socket/adapter/JettyWebSocketSession.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/socket/adapter/JettyWebSocketSession.java
@@ -209,7 +209,7 @@ protected Action process() {
 							}
 
 							ByteBuffer buffer = iterator.next();
-							boolean last = iterator.hasNext();
+							boolean last = !iterator.hasNext();
 							session.sendPartialBinary(buffer, last, Callback.from(this::succeeded, this::failed));
 							return Action.SCHEDULED;
 						}