diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index 7585b0e9c3d..33ba3c41443 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -574,7 +574,7 @@ fn color_to_nscolor_zero_currentcolor(color: Color) -> structs::nscolor {
     % endif
 </%def>
 
-<%def name="impl_corner_style_coord(ident, gecko_ffi_name, x_index, y_index, need_clone=False)">
+<%def name="impl_corner_style_coord(ident, gecko_ffi_name, x_index, y_index, need_clone)">
     #[allow(non_snake_case)]
     pub fn set_${ident}(&mut self, v: longhands::${ident}::computed_value::T) {
         v.0.width.to_gecko_style_coord(&mut self.gecko.${gecko_ffi_name}.data_at_mut(${x_index}));
@@ -1494,7 +1494,8 @@ fn static_assert() {
     <% impl_corner_style_coord("_moz_outline_radius_%s" % corner.ident.replace("_", ""),
                                "mOutlineRadius",
                                corner.x_index,
-                               corner.y_index) %>
+                               corner.y_index,
+                               need_clone=True) %>
     % endfor
 
     pub fn outline_has_nonzero_width(&self) -> bool {
diff --git a/components/style/properties/longhand/outline.mako.rs b/components/style/properties/longhand/outline.mako.rs
index 1640953e305..bd0f8e5ecbd 100644
--- a/components/style/properties/longhand/outline.mako.rs
+++ b/components/style/properties/longhand/outline.mako.rs
@@ -70,13 +70,12 @@ ${helpers.predefined_type("outline-width",
                           spec="https://drafts.csswg.org/css-ui/#propdef-outline-width")}
 
 // The -moz-outline-radius-* properties are non-standard and not on a standards track.
-// TODO: Should they animate?
 % for corner in ["topleft", "topright", "bottomright", "bottomleft"]:
     ${helpers.predefined_type("-moz-outline-radius-" + corner, "BorderCornerRadius",
         "computed::LengthOrPercentage::zero().into()",
         products="gecko",
         boxed=True,
-        animation_value_type="none",
+        animation_value_type="ComputedValue",
         spec="Nonstandard (https://developer.mozilla.org/en-US/docs/Web/CSS/-moz-outline-radius)")}
 % endfor