diff --git a/masque/file/gdsii.py b/masque/file/gdsii.py
index 85d77ea..fdf7086 100644
--- a/masque/file/gdsii.py
+++ b/masque/file/gdsii.py
@@ -468,7 +468,7 @@ def _disambiguate_pattern_names(patterns):
         if suffixed_name != sanitized_name:
             logger.warning('Pattern name "{}" appears multiple times; renaming to "{}"'.format(pat.name, suffixed_name))
 
-        encoded_name = sanitized_name.encode('ASCII')
+        encoded_name = suffixed_name.encode('ASCII')
         if len(encoded_name) == 0:
             raise PatternError('Zero-length name after sanitize+encode, originally "{}"'.format(pat.name))
         if len(encoded_name) > 32: