diff --git a/servo/components/compositing/compositor.rs b/servo/components/compositing/compositor.rs
index 50e91e09b643..e0d496c5652a 100644
--- a/servo/components/compositing/compositor.rs
+++ b/servo/components/compositing/compositor.rs
@@ -29,9 +29,10 @@ use layers::rendergl;
 use layers::rendergl::RenderContext;
 use layers::scene::Scene;
 use layout_traits::{ConvertPipelineIdToWebRender, LayoutControlChan};
-use msg::constellation_msg::{ConvertPipelineIdFromWebRender, Image, PixelFormat};
+use msg::constellation_msg::{Image, PixelFormat};
 use msg::constellation_msg::{Key, KeyModifiers, KeyState, LoadData};
-use msg::constellation_msg::{NavigationDirection, PipelineId, WindowSizeData, WindowSizeType};
+use msg::constellation_msg::{NavigationDirection, PipelineId, PipelineIndex, PipelineNamespaceId};
+use msg::constellation_msg::{WindowSizeData, WindowSizeType};
 use pipeline::CompositionPipeline;
 use profile_traits::mem::{self, ReportKind, Reporter, ReporterRequest};
 use profile_traits::time::{self, ProfilerCategory, profile};
@@ -79,6 +80,19 @@ const BUFFER_MAP_SIZE: usize = 10000000;
 const MAX_ZOOM: f32 = 8.0;
 const MIN_ZOOM: f32 = 0.1;
 
+pub trait ConvertPipelineIdFromWebRender {
+    fn from_webrender(&self) -> PipelineId;
+}
+
+impl ConvertPipelineIdFromWebRender for webrender_traits::PipelineId {
+    fn from_webrender(&self) -> PipelineId {
+        PipelineId {
+            namespace_id: PipelineNamespaceId(self.0),
+            index: PipelineIndex(self.1),
+        }
+    }
+}
+
 /// Holds the state when running reftests that determines when it is
 /// safe to save the output image.
 #[derive(Copy, Clone, PartialEq)]
diff --git a/servo/components/msg/constellation_msg.rs b/servo/components/msg/constellation_msg.rs
index 2a0cad524850..5114ae8a3848 100644
--- a/servo/components/msg/constellation_msg.rs
+++ b/servo/components/msg/constellation_msg.rs
@@ -359,19 +359,6 @@ impl fmt::Display for PipelineId {
 #[derive(Clone, PartialEq, Eq, Copy, Hash, Debug, Deserialize, Serialize, HeapSizeOf)]
 pub struct SubpageId(pub u32);
 
-pub trait ConvertPipelineIdFromWebRender {
-    fn from_webrender(&self) -> PipelineId;
-}
-
-impl ConvertPipelineIdFromWebRender for webrender_traits::PipelineId {
-    fn from_webrender(&self) -> PipelineId {
-        PipelineId {
-            namespace_id: PipelineNamespaceId(self.0),
-            index: PipelineIndex(self.1),
-        }
-    }
-}
-
 /// [Policies](https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-states)
 /// for providing a referrer header for a request
 #[derive(HeapSizeOf, Clone, Deserialize, Serialize)]