diff --git a/components/layout/query.rs b/components/layout/query.rs
index 61dd1c2ba33..27ee6c3b51a 100644
--- a/components/layout/query.rs
+++ b/components/layout/query.rs
@@ -795,7 +795,7 @@ fn create_font_declaration(
     url_data: &ServoUrl,
     quirks_mode: QuirksMode,
 ) -> Option<PropertyDeclarationBlock> {
-    let mut declarations = SourcePropertyDeclaration::new();
+    let mut declarations = SourcePropertyDeclaration::default();
     let result = parse_one_declaration_into(
         &mut declarations,
         property.clone(),
diff --git a/components/script/dom/cssstyledeclaration.rs b/components/script/dom/cssstyledeclaration.rs
index c9bc453fe06..0f4f5b880f0 100644
--- a/components/script/dom/cssstyledeclaration.rs
+++ b/components/script/dom/cssstyledeclaration.rs
@@ -301,7 +301,7 @@ impl CSSStyleDeclaration {
             // Step 5
             let window = self.owner.window();
             let quirks_mode = window.Document().quirks_mode();
-            let mut declarations = SourcePropertyDeclaration::new();
+            let mut declarations = SourcePropertyDeclaration::default();
             let result = parse_one_declaration_into(
                 &mut declarations,
                 id,
diff --git a/components/style/stylesheets/rule_parser.rs b/components/style/stylesheets/rule_parser.rs
index 0e8b6bb3e18..1e51e2b65b9 100644
--- a/components/style/stylesheets/rule_parser.rs
+++ b/components/style/stylesheets/rule_parser.rs
@@ -454,7 +454,10 @@ impl<'a, 'b, 'i> NestedRuleParser<'a, 'b, 'i> {
         if !self.context.rule_types.contains(CssRuleType::Style) {
             return true;
         }
-        static_prefs::pref!("layout.css.nesting.enabled")
+        #[cfg(feature = "gecko")]
+        return static_prefs::pref!("layout.css.nesting.enabled");
+        #[cfg(feature = "servo")]
+        return false;
     }
 
     fn nest_for_rule<R>(&mut self, rule_type: CssRuleType, cb: impl FnOnce(&mut Self) -> R) -> R {