diff --git a/src/librustc_mir/build/mod.rs b/src/librustc_mir/build/mod.rs
index b2f0ff57b62..77496c7b8f2 100644
--- a/src/librustc_mir/build/mod.rs
+++ b/src/librustc_mir/build/mod.rs
@@ -240,10 +240,10 @@ fn create_constructor_shim<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
 ///////////////////////////////////////////////////////////////////////////
 // BuildMir -- walks a crate, looking for fn items and methods to build MIR from
 
-pub fn closure_self_ty<'a, 'tcx>(tcx: TyCtxt<'a, 'tcx, 'tcx>,
-                             closure_expr_id: ast::NodeId,
-                             body_id: hir::BodyId)
-                             -> Ty<'tcx> {
+pub fn closure_self_ty<'a, 'gcx, 'tcx>(tcx: TyCtxt<'a, 'gcx, 'tcx>,
+                                       closure_expr_id: ast::NodeId,
+                                       body_id: hir::BodyId)
+                                       -> Ty<'tcx> {
     let closure_expr_hir_id = tcx.hir.node_to_hir_id(closure_expr_id);
     let closure_ty = tcx.body_tables(body_id).node_id_to_type(closure_expr_hir_id);