diff --git a/docs/docson/build-schema.json b/docs/docson/build-schema.json
index c0139a7e9f..82d5e24dc0 100644
--- a/docs/docson/build-schema.json
+++ b/docs/docson/build-schema.json
@@ -472,10 +472,6 @@
       "$ref": "#/definitions/package-specs",
       "description": "ReScript can currently output to [Commonjs](https://en.wikipedia.org/wiki/CommonJS), and [ES6 modules](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import)"
     },
-    "use-stdlib": {
-      "type": "boolean",
-      "description": "(Experimental) whether to use the OCaml standard library. Default: true"
-    },
     "external-stdlib": {
       "type": "string",
       "description": "Use the external stdlib library instead of the one shipped with the compiler package"
diff --git a/jscomp/bsb/bsb_build_schemas.ml b/jscomp/bsb/bsb_build_schemas.ml
index 5436f1cbb2..769f6a7a29 100644
--- a/jscomp/bsb/bsb_build_schemas.ml
+++ b/jscomp/bsb/bsb_build_schemas.ml
@@ -45,7 +45,6 @@ let package_specs = "package-specs"
 let type_ = "type"
 let export_all = "all"
 let export_none = "none"
-let use_stdlib = "use-stdlib"
 let external_stdlib = "external-stdlib"
 let reason = "reason"
 let react_jsx = "react-jsx"
diff --git a/jscomp/bsb/bsb_config_parse.ml b/jscomp/bsb/bsb_config_parse.ml
index 747a2b7e08..4a9aab131c 100644
--- a/jscomp/bsb/bsb_config_parse.ml
+++ b/jscomp/bsb/bsb_config_parse.ml
@@ -82,12 +82,6 @@ let extract_package_name_and_namespace (map : json_map) : string * string option
       bsc -runtime runtime_dir@version
       ```
 *)
-let check_stdlib (map : json_map) : bool =
-  (*built_in_package*)
-  match map.?(Bsb_build_schemas.use_stdlib) with
-  | Some (False _) -> false
-  | None | Some _ -> true
-
 let extract_gentype_config (map : json_map) : Bsb_config_types.gentype_config =
   match map.?(Bsb_build_schemas.gentypeconfig) with
   | None -> false
@@ -266,9 +260,6 @@ let interpret_json
       (* This line has to be before any calls to Bsb_global_backend.backend, because it'll read the entries
            array from the bsconfig and set the backend_ref to the first entry, if any. *)
 
-      (* The default situation is empty *)
-      let built_in_package : bool = check_stdlib map in
-
       let pp_flags : string option =
         extract_string map Bsb_build_schemas.pp_flags (fun p ->
             if p = "" then
@@ -343,7 +334,6 @@ let interpret_json
               | Pinned_dependency x | Dependency x -> x.package_specs);
             file_groups = groups;
             files_to_install = Queue.create ();
-            built_in_dependency = built_in_package;
             reason_react_jsx;
             jsx;
             generators = extract_generators map;
diff --git a/jscomp/bsb/bsb_config_types.ml b/jscomp/bsb/bsb_config_types.ml
index db5c007e4d..c80e3e88bf 100644
--- a/jscomp/bsb/bsb_config_types.ml
+++ b/jscomp/bsb/bsb_config_types.ml
@@ -47,7 +47,6 @@ type t = {
   bs_dependencies : dependencies;
   bs_dev_dependencies : dependencies;
   pinned_dependencies : Set_string.t;
-  built_in_dependency : bool;
   warning : Bsb_warning.t;
   (*TODO: maybe we should always resolve rescript
     so that we can calculate correct relative path in
diff --git a/jscomp/bsb/bsb_ninja_gen.ml b/jscomp/bsb/bsb_ninja_gen.ml
index d10b938591..6c80ffebd4 100644
--- a/jscomp/bsb/bsb_ninja_gen.ml
+++ b/jscomp/bsb/bsb_ninja_gen.ml
@@ -156,7 +156,6 @@ let output_ninja_and_namespace_map ~per_proj_dir ~package_kind
        package_specs;
        file_groups = { files = bs_file_groups };
        files_to_install;
-       built_in_dependency;
        reason_react_jsx;
        jsx;
        uncurried;
@@ -205,7 +204,7 @@ let output_ninja_and_namespace_map ~per_proj_dir ~package_kind
   in
   let rules : Bsb_ninja_rule.builtin =
     Bsb_ninja_rule.make_custom_rules ~gentype_config
-      ~has_postbuild:js_post_build_cmd ~pp_file ~has_builtin:built_in_dependency
+      ~has_postbuild:js_post_build_cmd ~pp_file
       ~reason_react_jsx ~jsx ~uncurried ~package_specs ~namespace ~digest ~package_name
       ~warnings ~ppx_files ~bsc_flags ~dpkg_incls (* dev dependencies *)
       ~lib_incls (* its own libs *)
diff --git a/jscomp/bsb/bsb_ninja_rule.ml b/jscomp/bsb/bsb_ninja_rule.ml
index 1103a3ac4c..8904ee0db6 100644
--- a/jscomp/bsb/bsb_ninja_rule.ml
+++ b/jscomp/bsb/bsb_ninja_rule.ml
@@ -89,7 +89,6 @@ type builtin = {
 
 let make_custom_rules ~(gentype_config : Bsb_config_types.gentype_config)
     ~(has_postbuild : string option) ~(pp_file : string option)
-    ~(has_builtin : bool)
     ~(reason_react_jsx : Bsb_config_types.reason_react_jsx option)
     ~(jsx : Bsb_jsx.t) ~(uncurried: bool)  ~(digest : string) ~(package_specs : Bsb_package_specs.t)
     ~(namespace : string option) ~package_name ~warnings
@@ -114,7 +113,6 @@ let make_custom_rules ~(gentype_config : Bsb_config_types.gentype_config)
     if is_dev then Ext_buffer.add_char_string buf ' ' dev_incls;
     Ext_buffer.add_char_string buf ' ' lib_incls;
     if is_dev then Ext_buffer.add_char_string buf ' ' dpkg_incls;
-    if not has_builtin then Ext_buffer.add_string buf " -nostdlib";
     Ext_buffer.add_char_string buf ' ' bsc_flags;
     Ext_buffer.add_char_string buf ' ' warnings;
     (* we need "-w a" in the end position to take effect
diff --git a/jscomp/bsb/bsb_ninja_rule.mli b/jscomp/bsb/bsb_ninja_rule.mli
index 5760ed8940..e5ede24173 100644
--- a/jscomp/bsb/bsb_ninja_rule.mli
+++ b/jscomp/bsb/bsb_ninja_rule.mli
@@ -69,7 +69,6 @@ val make_custom_rules :
   gentype_config:Bsb_config_types.gentype_config ->
   has_postbuild:string option ->
   pp_file:string option ->
-  has_builtin:bool ->
   reason_react_jsx:Bsb_config_types.reason_react_jsx option ->
   jsx:Bsb_jsx.t ->
   uncurried:bool ->
diff --git a/jscomp/bsc/rescript_compiler_main.ml b/jscomp/bsc/rescript_compiler_main.ml
index c139428e82..33d043cb8e 100644
--- a/jscomp/bsc/rescript_compiler_main.ml
+++ b/jscomp/bsc/rescript_compiler_main.ml
@@ -355,9 +355,6 @@ let buckle_script_flags : (string * Bsc_args.spec * string) array =
     "-bs-unsafe-empty-array",  set Config.unsafe_empty_array,
     "*internal* Allow [||] to be polymorphic";
 
-    "-nostdlib",  set Js_config.no_stdlib,
-    "*internal* Don't use stdlib";
-
     "-color", string_call set_color_option,
     "*internal* Enable or disable colors in compiler messages\n\
      The following settings are supported:\n\
diff --git a/jscomp/common/js_config.ml b/jscomp/common/js_config.ml
index 7602c681e2..379555b5f0 100644
--- a/jscomp/common/js_config.ml
+++ b/jscomp/common/js_config.ml
@@ -54,7 +54,6 @@ let jsx_module = ref React
 let jsx_mode = ref Automatic
 let js_stdout = ref true
 let all_module_aliases = ref false
-let no_stdlib = ref false
 let no_export = ref false
 let as_ppx = ref false
 
diff --git a/jscomp/common/js_config.mli b/jscomp/common/js_config.mli
index fd9df5785a..c162e0c86c 100644
--- a/jscomp/common/js_config.mli
+++ b/jscomp/common/js_config.mli
@@ -87,8 +87,6 @@ val js_stdout : bool ref
 
 val all_module_aliases : bool ref
 
-val no_stdlib : bool ref
-
 val no_export : bool ref
 
 val as_ppx : bool ref
diff --git a/jscomp/others/release.ninja b/jscomp/others/release.ninja
index 21b03b82eb..462cfaaeee 100644
--- a/jscomp/others/release.ninja
+++ b/jscomp/others/release.ninja
@@ -1,5 +1,5 @@
 
-bsc_primitive_flags =  -no-keep-locs -no-alias-deps -bs-no-version-header -bs-no-check-div-by-zero -nostdlib  -bs-cross-module-opt -make-runtime   -nopervasives  -unsafe  -w +50 -warn-error A
+bsc_primitive_flags =  -no-keep-locs -no-alias-deps -bs-no-version-header -bs-no-check-div-by-zero  -bs-cross-module-opt -make-runtime   -nopervasives  -unsafe  -w +50 -warn-error A
 bsc_flags = $bsc_primitive_flags -open Belt_internals
 
 rule cc
diff --git a/jscomp/runtime/release.ninja b/jscomp/runtime/release.ninja
index d21ca55b4d..d9214de2c3 100644
--- a/jscomp/runtime/release.ninja
+++ b/jscomp/runtime/release.ninja
@@ -1,5 +1,5 @@
 
-bsc_no_open_flags =  -no-keep-locs -no-alias-deps -bs-no-version-header -bs-no-check-div-by-zero -nostdlib  -bs-cross-module-opt -make-runtime  -nopervasives  -unsafe -w +50 -warn-error A
+bsc_no_open_flags =  -no-keep-locs -no-alias-deps -bs-no-version-header -bs-no-check-div-by-zero  -bs-cross-module-opt -make-runtime  -nopervasives  -unsafe -w +50 -warn-error A
 bsc_flags = $bsc_no_open_flags -open Bs_stdlib_mini
 
 rule cc
@@ -10,7 +10,7 @@ rule cc_cmi
     description = $in -> $out    
 
 o runtime/bs_stdlib_mini.cmi : cc runtime/bs_stdlib_mini.resi
-    bsc_flags = -nostdlib -nopervasives
+    bsc_flags = -nopervasives
 o runtime/js.cmj runtime/js.cmi : cc runtime/js.ml
     bsc_flags = $bsc_no_open_flags
 o runtime/caml.cmj : cc_cmi runtime/caml.res | runtime/caml.cmi runtime/caml_int64_extern.cmj
diff --git a/jscomp/stdlib-406/release.ninja b/jscomp/stdlib-406/release.ninja
index 992f90f652..ccd377821a 100644
--- a/jscomp/stdlib-406/release.ninja
+++ b/jscomp/stdlib-406/release.ninja
@@ -1,5 +1,5 @@
 
-bsc_flags = -no-keep-locs -no-alias-deps -bs-no-version-header -bs-no-check-div-by-zero -nostdlib  -bs-cross-module-opt -make-runtime -w -9-3-106 -warn-error A -I others
+bsc_flags = -no-keep-locs -no-alias-deps -bs-no-version-header -bs-no-check-div-by-zero  -bs-cross-module-opt -make-runtime -w -9-3-106 -warn-error A -I others
 
 rule cc
     command = $bsc -bs-cmi -bs-cmj $bsc_flags   -I stdlib-406  $in
diff --git a/scripts/ninja.js b/scripts/ninja.js
index bce31a4465..1dda2c3a17 100755
--- a/scripts/ninja.js
+++ b/scripts/ninja.js
@@ -30,7 +30,7 @@ var runtimeMliFiles = runtimeFiles.filter(
 var runtimeSourceFiles = runtimeMlFiles.concat(runtimeMliFiles);
 var runtimeJsFiles = [...new Set(runtimeSourceFiles.map(baseName))];
 
-var commonBsFlags = `-no-keep-locs -no-alias-deps -bs-no-version-header -bs-no-check-div-by-zero -nostdlib `;
+var commonBsFlags = `-no-keep-locs -no-alias-deps -bs-no-version-header -bs-no-check-div-by-zero `;
 var js_package = pseudoTarget("js_pkg");
 var runtimeTarget = pseudoTarget("runtime");
 var othersTarget = pseudoTarget("others");
@@ -842,7 +842,7 @@ ${ninjaQuickBuildList([
     "bs_stdlib_mini.resi",
     "cc",
     ninjaCwd,
-    [["bsc_flags", "-nostdlib -nopervasives"]],
+    [["bsc_flags", "-nopervasives"]],
     [],
     externalDeps,
   ],