diff --git a/rust/pin-init/internal/src/pin_data.rs b/rust/pin-init/internal/src/pin_data.rs
index 7d871236b49c..6b1b8f26379a 100644
--- a/rust/pin-init/internal/src/pin_data.rs
+++ b/rust/pin-init/internal/src/pin_data.rs
@@ -304,7 +304,9 @@ fn generate_projections(
         #[doc = #docs]
         #[allow(dead_code)]
         #[doc(hidden)]
-        #vis struct #projection #generics_with_pin_lt {
+        #vis struct #projection #generics_with_pin_lt
+            #whr
+        {
             #(#fields_decl)*
             ___pin_phantom_data: ::core::marker::PhantomData<&'__pin mut ()>,
         }