diff --git a/src/sagemaker/workflow/pipeline.py b/src/sagemaker/workflow/pipeline.py
index 62167b96e7..368227399b 100644
--- a/src/sagemaker/workflow/pipeline.py
+++ b/src/sagemaker/workflow/pipeline.py
@@ -382,7 +382,7 @@ def start(
             sagemaker_session=self.sagemaker_session,
         )
 
-    def definition(self) -> str:
+    def definition(self) -> Dict[str, Any]:
         """Converts a request structure to string representation for workflow service calls."""
         compiled_steps = StepsCompiler(
             pipeline_name=self.name,