diff --git a/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerAdapter.java b/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerAdapter.java
index 9c1e29f3e0..9e2cebbc5f 100644
--- a/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerAdapter.java
+++ b/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/RequestMappingHandlerAdapter.java
@@ -1048,7 +1048,7 @@ public class RequestMappingHandlerAdapter extends AbstractHandlerMethodAdapter
 	@SuppressWarnings("serial")
 	private class MvcSimpleAsyncTaskExecutor extends SimpleAsyncTaskExecutor {
 
-		private static Boolean taskExecutorWarning = true;
+		private static boolean taskExecutorWarning = true;
 
 		public MvcSimpleAsyncTaskExecutor() {
 			super("MvcAsync");