diff --git a/src/librustc/ty/util.rs b/src/librustc/ty/util.rs
index e04e0661ab226..38ef2e11869bf 100644
--- a/src/librustc/ty/util.rs
+++ b/src/librustc/ty/util.rs
@@ -714,7 +714,7 @@ impl<'a, 'gcx, 'tcx, W> TypeVisitor<'tcx> for TypeIdHasher<'a, 'gcx, 'tcx, W>
             }
             TyParam(p) => {
                 self.hash(p.idx);
-                self.hash(p.name);
+                self.hash(&p.name[..]);
             }
             TyProjection(ref data) => {
                 self.def_id(data.item_def_id);