diff --git a/library/init/lean/compiler/elimdead.lean b/library/init/lean/compiler/elimdead.lean
index 934c415fdf..ae86da4be0 100644
--- a/library/init/lean/compiler/elimdead.lean
+++ b/library/init/lean/compiler/elimdead.lean
@@ -3,6 +3,7 @@ Copyright (c) 2019 Microsoft Corporation. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Leonardo de Moura
 -/
+prelude
 import init.lean.compiler.ir
 
 namespace Lean
diff --git a/library/init/lean/compiler/pushproj.lean b/library/init/lean/compiler/pushproj.lean
index ae54c4f4d9..3b35c5ca62 100644
--- a/library/init/lean/compiler/pushproj.lean
+++ b/library/init/lean/compiler/pushproj.lean
@@ -3,6 +3,7 @@ Copyright (c) 2019 Microsoft Corporation. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Leonardo de Moura
 -/
+prelude
 import init.lean.compiler.ir
 
 namespace Lean
diff --git a/library/init/lean/compiler/simpcase.lean b/library/init/lean/compiler/simpcase.lean
index 5f4e44950b..91750ce260 100644
--- a/library/init/lean/compiler/simpcase.lean
+++ b/library/init/lean/compiler/simpcase.lean
@@ -3,6 +3,7 @@ Copyright (c) 2019 Microsoft Corporation. All rights reserved.
 Released under Apache 2.0 license as described in the file LICENSE.
 Authors: Leonardo de Moura
 -/
+prelude
 import init.lean.compiler.ir
 
 namespace Lean