diff --git a/src/constant.rs b/src/constant.rs
index 31278f810e91..b23fef6af2dc 100644
--- a/src/constant.rs
+++ b/src/constant.rs
@@ -149,6 +149,8 @@ pub(crate) fn codegen_const_value<'tcx>(
                         _ => unreachable!(),
                     };
 
+                    // FIXME avoid this extra copy to the stack and directly write to the final
+                    // destination
                     let place = CPlace::new_stack_slot(fx, layout);
                     place.to_ptr().store(fx, val, MemFlags::trusted());
                     place.to_cvalue(fx)