--- a/servo/components/style/properties/gecko.mako.rs
+++ b/servo/components/style/properties/gecko.mako.rs
@@ -4067,26 +4067,26 @@ fn static_assert() {
         fill_fields = "mRepeat mClip mOrigin mPositionX mPositionY mImage mSize"
         if shorthand == "background":
             fill_fields += " mAttachment mBlendMode"
         else:
             # mSourceURI uses mImageCount
             fill_fields += " mMaskMode mComposite"
     %>
     pub fn fill_arrays(&mut self) {
-        use gecko_bindings::bindings::Gecko_FillAll${shorthand.title()}Lists;
+        use gecko_bindings::bindings::Gecko_FillAllImageLayers;
         use std::cmp;
         let mut max_len = 1;
         % for member in fill_fields.split():
             max_len = cmp::max(max_len, self.gecko.${image_layers_field}.${member}Count);
         % endfor
         unsafe {
             // While we could do this manually, we'd need to also manually
             // run all the copy constructors, so we just delegate to gecko
-            Gecko_FillAll${shorthand.title()}Lists(&mut self.gecko.${image_layers_field}, max_len);
+            Gecko_FillAllImageLayers(&mut self.gecko.${image_layers_field}, max_len);
         }
     }
 </%def>
 
 // TODO: Gecko accepts lists in most background-related properties. We just use
 // the first element (which is the common case), but at some point we want to
 // add support for parsing these lists in servo and pushing to nsTArray's.
 <% skip_background_longhands = """background-repeat