diff --git a/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/name/NameValidator.java b/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/name/NameValidator.java
index f901d1c..2c71f42 100644
--- a/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/name/NameValidator.java
+++ b/oak-core/src/main/java/org/apache/jackrabbit/oak/plugins/name/NameValidator.java
@@ -57,7 +57,7 @@ class NameValidator extends DefaultValidator {
             }
             if (local.charAt(i) != '[') {
                 throw new CommitFailedException(
-                        CommitFailedException.NAME, 2, "Invalid name index " + name);
+                        CommitFailedException.NAME, 2, String.format("Invalid name index `%s`", name));
             } else {
                 local = local.substring(0, i);
             }
@@ -65,7 +65,7 @@ class NameValidator extends DefaultValidator {
 
         if (!Namespaces.isValidLocalName(local)) {
             throw new CommitFailedException(
-                    CommitFailedException.NAME, 3, "Invalid name: " + name);
+                    CommitFailedException.NAME, 3, String.format("Invalid name: `%s`", name));
         }
     }