diff --git a/components/style/gecko_bindings/sugar/ns_t_array.rs b/components/style/gecko_bindings/sugar/ns_t_array.rs
index 04ba326c615..d10ed420dd8 100644
--- a/components/style/gecko_bindings/sugar/ns_t_array.rs
+++ b/components/style/gecko_bindings/sugar/ns_t_array.rs
@@ -13,6 +13,7 @@ use std::slice;
 impl<T> Deref for nsTArray<T> {
     type Target = [T];
 
+    #[inline]
     fn deref<'a>(&'a self) -> &'a [T] {
         unsafe { slice::from_raw_parts(self.slice_begin(), self.header().mLength as usize) }
     }