diff --git a/sdk/ml/azure-ai-ml/azure/ai/ml/operations/_component_operations.py b/sdk/ml/azure-ai-ml/azure/ai/ml/operations/_component_operations.py
index 79530a092fc1..f9e43f1dbc54 100644
--- a/sdk/ml/azure-ai-ml/azure/ai/ml/operations/_component_operations.py
+++ b/sdk/ml/azure-ai-ml/azure/ai/ml/operations/_component_operations.py
@@ -686,7 +686,7 @@ def create_or_update(
         return component
 
     @experimental
-    def prepare_for_sign(self, component: Component):
+    def prepare_for_sign(self, component: Component) -> None:
         ignore_file = IgnoreFile()
 
         if isinstance(component, ComponentCodeMixin):