diff --git a/infer/src/base/IStd.ml b/infer/src/base/IStd.ml
index 2b2b56732..ed803197d 100644
--- a/infer/src/base/IStd.ml
+++ b/infer/src/base/IStd.ml
@@ -7,27 +7,7 @@
  * of patent rights can be found in the PATENTS file in the same directory.
  *)
 
-module Sys = struct
-  include Core.Std.Sys
-
-  (* Core_sys does not catch Unix_error ENAMETOOLONG, see
-     https://github.com/janestreet/core/issues/76 *)
-  let file_exists ?follow_symlinks path =
-    try file_exists ?follow_symlinks path
-    with Unix.Unix_error _ -> `Unknown
-
-  let is_directory ?follow_symlinks path =
-    try is_directory ?follow_symlinks path
-    with Unix.Unix_error _ -> `Unknown
-
-  let is_file ?follow_symlinks path =
-    try is_file ?follow_symlinks path
-    with Unix.Unix_error _ -> `Unknown
-end
-
-include
-  (Core.Std : module type of Core.Std
-   with module Sys := Sys)
+include Core.Std
 
 let ( @ ) = Caml.List.append
 
diff --git a/infer/src/base/IStd.mli b/infer/src/base/IStd.mli
deleted file mode 100644
index 97c63da00..000000000
--- a/infer/src/base/IStd.mli
+++ /dev/null
@@ -1,58 +0,0 @@
-(*
- * Copyright (c) 2016 - present Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD style license found in the
- * LICENSE file in the root directory of this source tree. An additional grant
- * of patent rights can be found in the PATENTS file in the same directory.
- *)
-
-open Core.Std
-
-(* Core's Gc and Signal modules wrap handler functions in catch-all exception handlers that
-   exit. This defeats the timeout mechanisms. So deprecate the offending functions to cause a
-   compilation failure if they are used. *)
-
-module Gc : sig
-  module Expert : sig
-    module Alarm : sig
-      include module type of Gc.Expert.Alarm
-      val create : (unit -> unit) -> t
-      [@@deprecated "Adds a catch-all exception handler that exits, use [Caml.Gc.create_alarm]"]
-    end
-    include module type of Gc.Expert with module Alarm := Alarm
-    val add_finalizer : 'a Heap_block.t -> ('a Heap_block.t -> unit) -> unit
-    [@@deprecated "Adds a catch-all exception handler that exits, use [Caml.Gc.finalise]"]
-    val add_finalizer_exn : 'a -> ('a -> unit) -> unit
-    [@@deprecated "Adds a catch-all exception handler that exits, use [Caml.Gc.finalise]"]
-  end
-  include (module type of Gc with module Expert := Expert)
-end
-
-module Signal : sig
-  module Expert : sig
-    include module type of Signal.Expert
-    val signal : Signal.t -> behavior -> behavior
-    [@@deprecated "Adds a catch-all exception handler that exits, use [Caml.Sys.signal]"]
-    val set : Signal.t -> behavior -> unit
-    [@@deprecated "Adds a catch-all exception handler that exits, use [Caml.Sys.set_signal]"]
-    val handle : Signal.t -> (Signal.t -> unit) -> unit
-    [@@deprecated "Adds a catch-all exception handler that exits, use [Caml.Sys.set_signal]"]
-  end
-  include (module type of Signal with module Expert := Expert)
-end
-
-include
-  (module type of Core.Std
-    with module Gc := Gc
-    and module Signal := Signal)
-
-module IntSet : Caml.Set.S with type elt = Int.t
-
-(* Compare police: generic compare mostly disabled. *)
-val compare : No_polymorphic_compare.compare
-val equal : No_polymorphic_compare.compare
-
-val failwithf : ('a, Format.formatter, unit, 'b) format4 -> 'a
-
-val invalid_argf : ('a, Format.formatter, unit, 'b) format4 -> 'a