diff --git a/source/tools/xmlvalidator/validate_grammar.py b/source/tools/xmlvalidator/validate_grammar.py
index 3d956ec8d8..c7e10426d3 100755
--- a/source/tools/xmlvalidator/validate_grammar.py
+++ b/source/tools/xmlvalidator/validate_grammar.py
@@ -21,7 +21,7 @@ class SingleLevelFilter(Filter):
         return record.levelno == self.passlevel
 
 
-class VFS_File:
+class VFSFile:
     def __init__(self, mod_name, vfs_path):
         self.mod_name = mod_name
         self.vfs_path = vfs_path