diff --git a/src/librustc_mir/build/into.rs b/src/librustc_mir/build/into.rs
index 5c133780e433..0d912513c6c7 100644
--- a/src/librustc_mir/build/into.rs
+++ b/src/librustc_mir/build/into.rs
@@ -18,7 +18,7 @@ use build::{BlockAnd, Builder};
 use hair::*;
 use rustc::mir::*;
 
-pub trait EvalInto<'tcx> {
+pub(in build) trait EvalInto<'tcx> {
     fn eval_into<'a, 'gcx>(self,
                            builder: &mut Builder<'a, 'gcx, 'tcx>,
                            destination: &Lvalue<'tcx>,
diff --git a/src/librustc_mir/build/mod.rs b/src/librustc_mir/build/mod.rs
index b8f1b754b48e..94c53611e74e 100644
--- a/src/librustc_mir/build/mod.rs
+++ b/src/librustc_mir/build/mod.rs
@@ -25,7 +25,7 @@ use rustc_data_structures::indexed_vec::{IndexVec, Idx};
 
 use std::u32;
 
-pub struct Builder<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
+struct Builder<'a, 'gcx: 'a+'tcx, 'tcx: 'a> {
     hir: Cx<'a, 'gcx, 'tcx>,
     cfg: CFG<'tcx>,
 
@@ -82,7 +82,7 @@ impl Idx for ScopeId {
 /// convenient.
 
 #[must_use] // if you don't use one of these results, you're leaving a dangling edge
-pub struct BlockAnd<T>(BasicBlock, T);
+struct BlockAnd<T>(BasicBlock, T);
 
 trait BlockAndExtension {
     fn and<T>(self, v: T) -> BlockAnd<T>;