diff --git a/server_fn/src/error.rs b/server_fn/src/error.rs
index e8d7a22dd..f7d878bbd 100644
--- a/server_fn/src/error.rs
+++ b/server_fn/src/error.rs
@@ -560,13 +560,16 @@ where
 }
 
 #[doc(hidden)]
-#[rustversion::attr(since(1.78), diagnostic::on_unimplemented(
-    message = "{Self} is not a `Result` or aliased `Result`. Server functions \
-               must return a `Result` or aliased `Result`.",
-    label = "Must return a `Result` or aliased `Result`.",
-    note = "If you are trying to return an alias of `Result`, you must also \
-            implement `FromServerFnError` for the error type."
-))]
+#[rustversion::attr(
+    since(1.78),
+    diagnostic::on_unimplemented(
+        message = "{Self} is not a `Result` or aliased `Result`. Server \
+                   functions must return a `Result` or aliased `Result`.",
+        label = "Must return a `Result` or aliased `Result`.",
+        note = "If you are trying to return an alias of `Result`, you must \
+                also implement `FromServerFnError` for the error type."
+    )
+)]
 /// A trait for extracting the error and ok types from a [`Result`]. This is used to allow alias types to be returned from server functions.
 pub trait ServerFnMustReturnResult {
     /// The error type of the [`Result`].