diff --git a/datafusion/expr/src/logical_plan/extension.rs b/datafusion/expr/src/logical_plan/extension.rs
index 2f581c1928f4..5514ec2925d9 100644
--- a/datafusion/expr/src/logical_plan/extension.rs
+++ b/datafusion/expr/src/logical_plan/extension.rs
@@ -212,8 +212,8 @@ impl Eq for dyn UserDefinedLogicalNode {}
 /// This trait facilitates implementation of the [`UserDefinedLogicalNode`].
 ///
 /// See the example in
-/// [user_defined_plan.rs](../../tests/user_defined_plan.rs) for an
-/// example of how to use this extension API.
+/// [user_defined_plan.rs](https://github.com/apache/datafusion/blob/main/datafusion/core/tests/user_defined/user_defined_plan.rs)
+/// file for an example of how to use this extension API.
 pub trait UserDefinedLogicalNodeCore:
     fmt::Debug + Eq + Hash + Sized + Send + Sync + 'static
 {