diff --git a/libs/core/langchain_core/runnables/base.py b/libs/core/langchain_core/runnables/base.py
index 9f9a77bc705..cb11cfbd900 100644
--- a/libs/core/langchain_core/runnables/base.py
+++ b/libs/core/langchain_core/runnables/base.py
@@ -3593,6 +3593,12 @@ class RunnableParallel(RunnableSerializable[Input, dict[str, Any]]):
             == "object"
             for s in self.steps__.values()
         ):
+            for step in self.steps__.values():
+                for k, v in step.get_input_schema(config).model_fields.items():
+                    if v.annotation != Any and k == "root":
+                        return super().get_input_schema(config)
+
+
             # This is correct, but pydantic typings/mypy don't think so.
             return create_model_v2(  # type: ignore[call-overload]
                 self.get_name("Input"),