diff --git a/butterfree/transform/transformations/aggregated_transform.py b/butterfree/transform/transformations/aggregated_transform.py
index 2c7a8ced2..7304f34b6 100644
--- a/butterfree/transform/transformations/aggregated_transform.py
+++ b/butterfree/transform/transformations/aggregated_transform.py
@@ -88,7 +88,7 @@ def _get_output_name(self, function: object) -> str:
                 """
             )
 
-        base_name = "__".join([self._parent.name, function.__name__])
+        base_name = "__".join([self._parent.name, str(function.__name__).lower()])
         return base_name
 
     @property
diff --git a/setup.py b/setup.py
index 56cf8842e..daaa264b1 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import find_packages, setup
 
 __package_name__ = "butterfree"
-__version__ = "1.2.0.dev17"
+__version__ = "1.2.0.dev18"
 __repository_url__ = "https://github.com/quintoandar/butterfree"
 
 with open("requirements.txt") as f: