diff --git a/src/wxflow/schema.py b/src/wxflow/schema.py
index fbb1263..82c13ba 100644
--- a/src/wxflow/schema.py
+++ b/src/wxflow/schema.py
@@ -606,7 +606,7 @@ def _to_schema(s, ignore_extra_keys):
                         return_schema["allOf"] = all_of_values
                 elif flavor == COMPARABLE:
                     return_schema["const"] = _to_json_type(s)
-                elif flavor == VALIDATOR and type(s) == Regex:
+                elif flavor == VALIDATOR and type(s) is Regex:
                     return_schema["type"] = "string"
                     return_schema["pattern"] = s.pattern_str
                 else: