diff --git a/s3path/current_version.py b/s3path/current_version.py
index a9f481d..ed2f58d 100644
--- a/s3path/current_version.py
+++ b/s3path/current_version.py
@@ -759,7 +759,7 @@ def _compile_pattern_parts(self, prefix, pattern, bucket):
                 new_regex_pattern += f'{self._path._flavour.sep}*(?s:{part.replace("**", ".*")})'
                 continue
             new_regex_pattern += f'{self._path._flavour.sep}{fnmatch.translate(part)[:-2]}'
-        new_regex_pattern += '/*\Z'
+        new_regex_pattern += r'/*\Z'
 
         return re.compile(new_regex_pattern).fullmatch