diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index 00be40d30a9..c424ca705a7 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -1035,7 +1035,24 @@ fn static_assert() {
                                             "-moz-groupbox",
                                             gecko_enum_prefix="StyleDisplay",
                                             gecko_strip_moz_prefix=False) %>
-    ${impl_keyword('display', 'mDisplay', display_keyword, True)}
+
+    pub fn set_display(&mut self, v: longhands::display::computed_value::T) {
+        use properties::longhands::display::computed_value::T as Keyword;
+        // FIXME(bholley): Align binary representations and ditch |match| for cast + static_asserts
+        let result = match v {
+            % for value in display_keyword.values_for('gecko'):
+                Keyword::${to_rust_ident(value)} =>
+                    structs::${display_keyword.gecko_constant(value)},
+            % endfor
+        };
+        self.gecko.mDisplay = result;
+        self.gecko.mOriginalDisplay = result;
+    }
+    pub fn copy_display_from(&mut self, other: &Self) {
+        self.gecko.mDisplay = other.gecko.mDisplay;
+        self.gecko.mOriginalDisplay = other.gecko.mOriginalDisplay;
+    }
+    <%call expr="impl_keyword_clone('display', 'mDisplay', display_keyword)"></%call>
 
     // overflow-y is implemented as a newtype of overflow-x, so we need special handling.
     // We could generalize this if we run into other newtype keywords.