diff --git a/components/layout_thread/lib.rs b/components/layout_thread/lib.rs
index 097cf74a2ac..dfbbbb1ae64 100644
--- a/components/layout_thread/lib.rs
+++ b/components/layout_thread/lib.rs
@@ -129,7 +129,6 @@ use style::context::RegisteredSpeculativePainters;
 use style::dom::{ShowSubtree, ShowSubtreeDataAndPrimaryValues, TElement, TNode};
 use style::error_reporting::{NullReporter, RustLogReporter};
 use style::invalidation::element::restyle_hints::RestyleHint;
-use style::invalidation::media_queries::{MediaListKey, ToMediaListKey};
 use style::logical_geometry::LogicalPoint;
 use style::media_queries::{Device, MediaList, MediaType};
 use style::properties::PropertyId;
@@ -137,7 +136,7 @@ use style::selector_parser::SnapshotMap;
 use style::servo::restyle_damage::{REFLOW, REFLOW_OUT_OF_FLOW, REPAINT, REPOSITION, STORE_OVERFLOW};
 use style::shared_lock::{SharedRwLock, SharedRwLockReadGuard, StylesheetGuards};
 use style::stylesheet_set::StylesheetSet;
-use style::stylesheets::{Origin, Stylesheet, StylesheetContents, StylesheetInDocument, UserAgentStylesheets};
+use style::stylesheets::{Origin, Stylesheet, DocumentStyleSheet, StylesheetInDocument, UserAgentStylesheets};
 use style::stylist::Stylist;
 use style::thread_state;
 use style::timer::Timer;
@@ -147,35 +146,6 @@ use style_traits::CSSPixel;
 use style_traits::DevicePixel;
 use style_traits::SpeculativePainter;
 
-#[derive(Clone)]
-struct DocumentStyleSheet(ServoArc<Stylesheet>);
-
-impl PartialEq for DocumentStyleSheet {
-    fn eq(&self, other: &Self) -> bool {
-        ServoArc::ptr_eq(&self.0, &other.0)
-    }
-}
-
-impl ToMediaListKey for DocumentStyleSheet {
-    fn to_media_list_key(&self) -> MediaListKey {
-        self.0.to_media_list_key()
-    }
-}
-
-impl StylesheetInDocument for DocumentStyleSheet {
-    fn contents(&self, guard: &SharedRwLockReadGuard) -> &StylesheetContents {
-        self.0.contents(guard)
-    }
-
-    fn media<'a>(&'a self, guard: &'a SharedRwLockReadGuard) -> Option<&'a MediaList> {
-        self.0.media(guard)
-    }
-
-    fn enabled(&self) -> bool {
-        self.0.enabled()
-    }
-}
-
 /// Information needed by the layout thread.
 pub struct LayoutThread {
     /// The ID of the pipeline that we belong to.
diff --git a/components/style/stylesheets/mod.rs b/components/style/stylesheets/mod.rs
index e418878363d..ff3ed8c333f 100644
--- a/components/style/stylesheets/mod.rs
+++ b/components/style/stylesheets/mod.rs
@@ -49,7 +49,8 @@ pub use self::page_rule::PageRule;
 pub use self::rule_parser::{State, TopLevelRuleParser};
 pub use self::rule_list::{CssRules, CssRulesHelpers};
 pub use self::rules_iterator::{AllRules, EffectiveRules, NestedRuleIterationCondition, RulesIterator};
-pub use self::stylesheet::{Namespaces, Stylesheet, StylesheetContents, StylesheetInDocument, UserAgentStylesheets};
+pub use self::stylesheet::{Namespaces, Stylesheet, DocumentStyleSheet};
+pub use self::stylesheet::{StylesheetContents, StylesheetInDocument, UserAgentStylesheets};
 pub use self::style_rule::StyleRule;
 pub use self::supports_rule::SupportsRule;
 pub use self::viewport_rule::ViewportRule;
diff --git a/components/style/stylesheets/stylesheet.rs b/components/style/stylesheets/stylesheet.rs
index 15d6d5ceec8..d5e953a9525 100644
--- a/components/style/stylesheets/stylesheet.rs
+++ b/components/style/stylesheets/stylesheet.rs
@@ -7,6 +7,7 @@ use context::QuirksMode;
 use cssparser::{Parser, RuleListParser, ParserInput};
 use error_reporting::{ParseErrorReporter, ContextualParseError};
 use fnv::FnvHashMap;
+use invalidation::media_queries::{MediaListKey, ToMediaListKey};
 use media_queries::{MediaList, Device};
 use parking_lot::RwLock;
 use parser::ParserContext;
@@ -275,6 +276,37 @@ impl StylesheetInDocument for Stylesheet {
     }
 }
 
+/// A simple wrapper over an `Arc<Stylesheet>`, with pointer comparison, and
+/// suitable for its use in a `StylesheetSet`.
+#[derive(Clone)]
+pub struct DocumentStyleSheet(pub Arc<Stylesheet>);
+
+impl PartialEq for DocumentStyleSheet {
+    fn eq(&self, other: &Self) -> bool {
+        Arc::ptr_eq(&self.0, &other.0)
+    }
+}
+
+impl ToMediaListKey for DocumentStyleSheet {
+    fn to_media_list_key(&self) -> MediaListKey {
+        self.0.to_media_list_key()
+    }
+}
+
+impl StylesheetInDocument for DocumentStyleSheet {
+    fn contents(&self, guard: &SharedRwLockReadGuard) -> &StylesheetContents {
+        self.0.contents(guard)
+    }
+
+    fn media<'a>(&'a self, guard: &'a SharedRwLockReadGuard) -> Option<&'a MediaList> {
+        self.0.media(guard)
+    }
+
+    fn enabled(&self) -> bool {
+        self.0.enabled()
+    }
+}
+
 impl Stylesheet {
     /// Updates an empty stylesheet from a given string of text.
     pub fn update_from_str(existing: &Stylesheet,