diff --git a/config/src/main/java/org/springframework/security/config/annotation/web/AbstractRequestMatcherRegistry.java b/config/src/main/java/org/springframework/security/config/annotation/web/AbstractRequestMatcherRegistry.java
index 0cf3cb7e04..0f779f2df3 100644
--- a/config/src/main/java/org/springframework/security/config/annotation/web/AbstractRequestMatcherRegistry.java
+++ b/config/src/main/java/org/springframework/security/config/annotation/web/AbstractRequestMatcherRegistry.java
@@ -509,7 +509,8 @@ public abstract class AbstractRequestMatcherRegistry<C> {
 		public boolean matches(HttpServletRequest request) {
 			String name = request.getHttpServletMapping().getServletName();
 			ServletRegistration registration = this.servletContext.getServletRegistration(name);
-			Assert.notNull(registration, computeErrorMessage(this.servletContext.getServletRegistrations().values()));
+			Assert.notNull(registration,
+					() -> computeErrorMessage(this.servletContext.getServletRegistrations().values()));
 			try {
 				Class<?> clazz = Class.forName(registration.getClassName());
 				return DispatcherServlet.class.isAssignableFrom(clazz);