diff --git a/spring-messaging/src/main/java/org/springframework/messaging/simp/annotation/support/PrincipalMethodArgumentResolver.java b/spring-messaging/src/main/java/org/springframework/messaging/simp/annotation/support/PrincipalMethodArgumentResolver.java
index 859eaef433..6b9a013386 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/simp/annotation/support/PrincipalMethodArgumentResolver.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/simp/annotation/support/PrincipalMethodArgumentResolver.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2018 the original author or authors.
+ * Copyright 2002-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,7 +25,7 @@ import org.springframework.messaging.handler.invocation.HandlerMethodArgumentRes
 import org.springframework.messaging.simp.SimpMessageHeaderAccessor;
 
 /**
- * {@link HandlerMethodArgumentResolver} to a {@link Principal} or {@link Optional} of {@link Principal}.
+ * Resolver for arguments of type {@link Principal}, including {@code Optional<Principal>}.
  *
  * @author Rossen Stoyanchev
  * @since 4.0
@@ -42,11 +42,7 @@ public class PrincipalMethodArgumentResolver implements HandlerMethodArgumentRes
 	@Override
 	public Object resolveArgument(MethodParameter parameter, Message<?> message){
 		Principal user = SimpMessageHeaderAccessor.getUser(message.getHeaders());
-		if (parameter.isOptional()) {
-			return Optional.ofNullable(user);
-		} else {
-			return user;
-		}
+		return parameter.isOptional() ? Optional.ofNullable(user) : user;
 	}
 
 }