diff --git a/components/style/values/generics/calc.rs b/components/style/values/generics/calc.rs
index cd331818386..0d791e5d00d 100644
--- a/components/style/values/generics/calc.rs
+++ b/components/style/values/generics/calc.rs
@@ -60,6 +60,13 @@ pub enum SortKey {
 ///
 /// FIXME: This would be much more elegant if we used `Self` in the types below,
 /// but we can't because of https://github.com/serde-rs/serde/issues/1565.
+///
+/// FIXME: The following annotations are to workaround an LLVM inlining bug, see
+/// bug 1631929.
+///
+/// cbindgen:destructor-attributes=MOZ_NEVER_INLINE
+/// cbindgen:copy-constructor-attributes=MOZ_NEVER_INLINE
+/// cbindgen:eq-attributes=MOZ_NEVER_INLINE
 #[repr(u8)]
 #[derive(
     Clone,