diff --git a/core/src/main/java/org/apache/struts2/dispatcher/mapper/DefaultActionMapper.java b/core/src/main/java/org/apache/struts2/dispatcher/mapper/DefaultActionMapper.java
index 95bd5c163..06c31d4b3 100644
--- a/core/src/main/java/org/apache/struts2/dispatcher/mapper/DefaultActionMapper.java
+++ b/core/src/main/java/org/apache/struts2/dispatcher/mapper/DefaultActionMapper.java
@@ -418,7 +418,7 @@ public class DefaultActionMapper implements ActionMapper {
         } else {
             LOG.warn(
                 "{} did not match allowed namespace names {} - default namespace {} will be used!",
-                rawNamespace, allowedActionNames, defaultActionName
+                rawNamespace, allowedNamespaceNames, defaultNamespaceName
             );
             return defaultNamespaceName;
         }