diff --git a/src/librustc/middle/ty.rs b/src/librustc/middle/ty.rs
index 1e817890440f2..eab87dc846d64 100644
--- a/src/librustc/middle/ty.rs
+++ b/src/librustc/middle/ty.rs
@@ -437,7 +437,7 @@ pub struct MethodObject<'tcx> {
     pub vtable_index: usize,
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 pub struct MethodCallee<'tcx> {
     pub origin: MethodOrigin<'tcx>,
     pub ty: Ty<'tcx>,