diff --git a/spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/test/CustomBlockHoundIntegration.java b/spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/test/CustomBlockHoundIntegration.java
index f18c3a3a..2b07fad4 100644
--- a/spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/test/CustomBlockHoundIntegration.java
+++ b/spring-cloud-gateway-server/src/test/java/org/springframework/cloud/gateway/test/CustomBlockHoundIntegration.java
@@ -88,6 +88,7 @@ public class CustomBlockHoundIntegration implements BlockHoundIntegration {
 				"lambda$authenticate$4");
 
 		builder.allowBlockingCallsInside("org.springframework.context.annotation.ConfigurationClassParser", "parse");
+		builder.allowBlockingCallsInside("org.springframework.core.type.classreading.SimpleMetadataReader", "getClassReader");
 	}
 
 }