diff --git a/components/style/properties/helpers/animated_properties.mako.rs b/components/style/properties/helpers/animated_properties.mako.rs
index a5f1abd935e..f47a0cc949d 100644
--- a/components/style/properties/helpers/animated_properties.mako.rs
+++ b/components/style/properties/helpers/animated_properties.mako.rs
@@ -363,6 +363,7 @@ pub enum AnimationValue {
 
 impl AnimationValue {
     /// Returns the longhand id this animated value corresponds to.
+    #[inline]
     pub fn id(&self) -> LonghandId {
         let id = unsafe { *(self as *const _ as *const LonghandId) };
         debug_assert_eq!(id, match *self {
diff --git a/components/style/properties/properties.mako.rs b/components/style/properties/properties.mako.rs
index 254bfc254c1..fb3281348a5 100644
--- a/components/style/properties/properties.mako.rs
+++ b/components/style/properties/properties.mako.rs
@@ -1739,6 +1739,7 @@ impl fmt::Debug for PropertyDeclaration {
 
 impl PropertyDeclaration {
     /// Given a property declaration, return the property declaration id.
+    #[inline]
     pub fn id(&self) -> PropertyDeclarationId {
         match *self {
             PropertyDeclaration::Custom(ref declaration) => {