diff --git a/components/msg/constellation_msg.rs b/components/msg/constellation_msg.rs
index 9eb2a0066b8..696dfb2e397 100644
--- a/components/msg/constellation_msg.rs
+++ b/components/msg/constellation_msg.rs
@@ -312,7 +312,7 @@ pub enum NavigationDirection {
 pub struct FrameId(pub u32);
 
 #[derive(Clone, PartialEq, Eq, Copy, Hash, Debug)]
-pub struct WorkerId(pub uint);
+pub struct WorkerId(pub u32);
 
 #[derive(Clone, PartialEq, Eq, Copy, Hash, Debug)]
 pub struct PipelineId(pub uint);