diff --git a/metadata-ingestion/src/datahub/ingestion/source/mode.py b/metadata-ingestion/src/datahub/ingestion/source/mode.py
index 1fed07488ac0f..8dcdc5eeef404 100644
--- a/metadata-ingestion/src/datahub/ingestion/source/mode.py
+++ b/metadata-ingestion/src/datahub/ingestion/source/mode.py
@@ -593,7 +593,7 @@ def _replace_definitions(self, raw_query: str) -> str:
     def _parse_definition_name(self, definition_variable: str) -> Tuple[str, str]:
         name, alias = "", ""
         # i.e '{{ @join_on_definition as alias}}'
-        name_match = re.findall("@[a-zA-Z]+", definition_variable)
+        name_match = re.findall("@[a-zA-z]+", definition_variable)
         if len(name_match):
             name = name_match[0][1:]
         alias_match = re.findall(