diff --git a/spring-test/src/main/java/org/springframework/test/web/servlet/TestDispatcherServlet.java b/spring-test/src/main/java/org/springframework/test/web/servlet/TestDispatcherServlet.java
index 13ea8e051a..4ff1de8e7e 100644
--- a/spring-test/src/main/java/org/springframework/test/web/servlet/TestDispatcherServlet.java
+++ b/spring-test/src/main/java/org/springframework/test/web/servlet/TestDispatcherServlet.java
@@ -79,10 +79,9 @@ final class TestDispatcherServlet extends DispatcherServlet {
 				MockHttpServletRequest mockRequest = WebUtils.getNativeRequest(request, MockHttpServletRequest.class);
 				Assert.notNull(mockRequest, "Expected MockHttpServletRequest");
 				asyncContext = (MockAsyncContext) mockRequest.getAsyncContext();
-				Assert.notNull(asyncContext, () ->
-						"Outer request wrapper " + request.getClass().getName() + " has an AsyncContext," +
-								"but it is not a MockAsyncContext, while the nested " +
-								mockRequest.getClass().getName() + " does not have an AsyncContext at all.");
+				Assert.notNull(asyncContext, "Outer request wrapper " + request.getClass().getName() +
+						" has an AsyncContext,but it is not a MockAsyncContext, while the nested " +
+						mockRequest.getClass().getName() + " does not have an AsyncContext at all.");
 			}
 
 			final CountDownLatch dispatchLatch = new CountDownLatch(1);