diff --git a/tools/verify_docs/bin/verify_docs.dart b/tools/verify_docs/bin/verify_docs.dart
index 0a25405c5ab..162da88bac9 100755
--- a/tools/verify_docs/bin/verify_docs.dart
+++ b/tools/verify_docs/bin/verify_docs.dart
@@ -372,7 +372,7 @@ class ValidateCommentCodeSamplesVisitor extends GeneralizingAstVisitor {
           final location = result.lineInfo.getLocation(diagnostic.offset);
           print(
             '  ${_severity(diagnostic.severity)}: ${diagnostic.message} '
-            '[$location] (${diagnostic.diagnosticCode.name.toLowerCase()})',
+            '[$location] (${diagnostic.diagnosticCode.lowerCaseName})',
           );
         }
         print('');