diff --git a/datafusion/expr/src/udf.rs b/datafusion/expr/src/udf.rs
index 40e0da2678eb..f92a5356e458 100644
--- a/datafusion/expr/src/udf.rs
+++ b/datafusion/expr/src/udf.rs
@@ -198,8 +198,9 @@ impl ScalarUDF {
         self.inner.simplify(args, info)
     }
 
-    #[allow(deprecated)]
+    #[deprecated(since = "50.0.0", note = "Use `return_field_from_args` instead.")]
     pub fn is_nullable(&self, args: &[Expr], schema: &dyn ExprSchema) -> bool {
+        #[allow(deprecated)]
         self.inner.is_nullable(args, schema)
     }