diff --git a/metaflow/plugins/pypi/conda_decorator.py b/metaflow/plugins/pypi/conda_decorator.py
index 0a3db934806..3d7dabe06b8 100644
--- a/metaflow/plugins/pypi/conda_decorator.py
+++ b/metaflow/plugins/pypi/conda_decorator.py
@@ -50,6 +50,9 @@ class CondaStepDecorator(StepDecorator):
     # conda channels, users can specify channel::package as the package name.
 
     def __init__(self, attributes=None, statically_defined=False):
+        self._user_defined_attributes = (
+            attributes.copy() if attributes is not None else {}
+        )
         super(CondaStepDecorator, self).__init__(attributes, statically_defined)
 
         # Support legacy 'libraries=' attribute for the decorator.
@@ -59,6 +62,9 @@ def __init__(self, attributes=None, statically_defined=False):
         }
         del self.attributes["libraries"]
 
+    def is_attribute_user_defined(self, name):
+        return name in self._user_defined_attributes
+
     def step_init(self, flow, graph, step, decos, environment, flow_datastore, logger):
         # The init_environment hook for Environment creates the relevant virtual
         # environments. The step_init hook sets up the relevant state for that hook to
@@ -71,11 +77,16 @@ def step_init(self, flow, graph, step, decos, environment, flow_datastore, logge
 
         # Support flow-level decorator.
         if "conda_base" in self.flow._flow_decorators:
-            super_attributes = self.flow._flow_decorators["conda_base"][0].attributes
+            conda_base = self.flow._flow_decorators["conda_base"][0]
+            super_attributes = conda_base.attributes
             self.attributes["packages"] = {
                 **super_attributes["packages"],
                 **self.attributes["packages"],
             }
+            self._user_defined_attributes = {
+                **self._user_defined_attributes,
+                **conda_base._user_defined_attributes,
+            }
             self.attributes["python"] = (
                 self.attributes["python"] or super_attributes["python"]
             )
@@ -322,6 +333,9 @@ class CondaFlowDecorator(FlowDecorator):
     }
 
     def __init__(self, attributes=None, statically_defined=False):
+        self._user_defined_attributes = (
+            attributes.copy() if attributes is not None else {}
+        )
         super(CondaFlowDecorator, self).__init__(attributes, statically_defined)
 
         # Support legacy 'libraries=' attribute for the decorator.
@@ -333,6 +347,9 @@ def __init__(self, attributes=None, statically_defined=False):
         if self.attributes["python"]:
             self.attributes["python"] = str(self.attributes["python"])
 
+    def is_attribute_user_defined(self, name):
+        return name in self._user_defined_attributes
+
     def flow_init(
         self, flow, graph, environment, flow_datastore, metadata, logger, echo, options
     ):