diff --git a/action/_v1_config_template.py b/action/_v1_config_template.py
index f080d1d..0afffb5 100644
--- a/action/_v1_config_template.py
+++ b/action/_v1_config_template.py
@@ -278,6 +278,7 @@ class ActionModule(object):
             dict_type=MultiKeyDict,
             allow_no_value=True
         )
+        config.optionxform = str
         config_object = io.BytesIO(resultant.encode('utf-8'))
         config.readfp(config_object)
         for section, items in config_overrides.items():
diff --git a/action/_v2_config_template.py b/action/_v2_config_template.py
index b039db2..6870f96 100644
--- a/action/_v2_config_template.py
+++ b/action/_v2_config_template.py
@@ -277,6 +277,7 @@ class ActionModule(ActionBase):
                 allow_no_value=True,
                 dict_type=MultiKeyDict
             )
+            config.optionxform = str
         except Exception:
             config = ConfigTemplateParser(dict_type=MultiKeyDict)