diff --git a/pkgs/build-support/rust/build-rust-package/default.nix b/pkgs/build-support/rust/build-rust-package/default.nix
index 909ec8f4c05f8..058d5a674f26f 100644
--- a/pkgs/build-support/rust/build-rust-package/default.nix
+++ b/pkgs/build-support/rust/build-rust-package/default.nix
@@ -54,9 +54,6 @@
 
   depsExtraArgs ? { },
 
-  # Toggles whether a custom sysroot is created when the target is a .json file.
-  __internal_dontAddSysroot ? false,
-
   # Needed to `pushd`/`popd` into a subdir of a tarball if this subdir
   # contains a Cargo.toml, but isn't part of a workspace (which is e.g. the
   # case for `rustfmt`/etc from the `rust-sources).
@@ -125,21 +122,8 @@ let
 
   target = stdenv.hostPlatform.rust.rustcTargetSpec;
   targetIsJSON = lib.hasSuffix ".json" target;
-  useSysroot = targetIsJSON && !__internal_dontAddSysroot;
-
-  sysroot = callPackage ./sysroot { } {
-    inherit target;
-    shortTarget = stdenv.hostPlatform.rust.cargoShortTarget;
-    RUSTFLAGS = args.RUSTFLAGS or "";
-    originalCargoToml = src + /Cargo.toml; # profile info is later extracted
-  };
-
 in
 
-# Tests don't currently work for `no_std`, and all custom sysroots are currently built without `std`.
-# See https://os.phil-opp.com/testing/ for more information.
-assert useSysroot -> !(args.doCheck or true);
-
 stdenv.mkDerivation (
   (removeAttrs args [
     "depsExtraArgs"
@@ -147,14 +131,8 @@ stdenv.mkDerivation (
     "cargoDeps"
     "cargoLock"
   ])
-  // lib.optionalAttrs useSysroot {
-    RUSTFLAGS = "--sysroot ${sysroot} " + (args.RUSTFLAGS or "");
-  }
   // lib.optionalAttrs (stdenv.hostPlatform.isDarwin && buildType == "debug") {
-    RUSTFLAGS =
-      "-C split-debuginfo=packed "
-      + lib.optionalString useSysroot "--sysroot ${sysroot} "
-      + (args.RUSTFLAGS or "");
+    RUSTFLAGS = "-C split-debuginfo=packed " + (args.RUSTFLAGS or "");
   }
   // {
     cargoDeps = cargoDeps';
diff --git a/pkgs/build-support/rust/build-rust-package/sysroot/default.nix b/pkgs/build-support/rust/build-rust-package/sysroot/default.nix
deleted file mode 100644
index d9d071df06ccc..0000000000000
--- a/pkgs/build-support/rust/build-rust-package/sysroot/default.nix
+++ /dev/null
@@ -1,52 +0,0 @@
-{
-  lib,
-  stdenv,
-  rustPlatform,
-  buildPackages,
-}:
-
-{
-  shortTarget,
-  originalCargoToml,
-  target,
-  RUSTFLAGS,
-}:
-
-let
-  cargoSrc = import ../../sysroot/src.nix {
-    inherit
-      lib
-      stdenv
-      rustPlatform
-      buildPackages
-      originalCargoToml
-      ;
-  };
-in
-rustPlatform.buildRustPackage {
-  inherit target RUSTFLAGS;
-
-  name = "custom-sysroot";
-  src = cargoSrc;
-
-  RUSTC_BOOTSTRAP = 1;
-  __internal_dontAddSysroot = true;
-  cargoHash = "sha256-zgkwevitxsu1C4OgGTsqNSc0gDxaNXYK1WPbfER48d0=";
-
-  doCheck = false;
-
-  installPhase = ''
-    export LIBS_DIR=$out/lib/rustlib/${shortTarget}/lib
-    mkdir -p $LIBS_DIR
-    for f in target/${shortTarget}/release/deps/*.{rlib,rmeta}; do
-      cp $f $LIBS_DIR
-    done
-
-    export RUST_SYSROOT=$(rustc --print=sysroot)
-    host=${stdenv.buildPlatform.rust.rustcTarget}
-    cp -r $RUST_SYSROOT/lib/rustlib/$host $out
-  '';
-
-  # allows support for cross-compilation
-  meta.platforms = lib.platforms.all;
-}
diff --git a/pkgs/build-support/rust/sysroot/Cargo.lock b/pkgs/build-support/rust/sysroot/Cargo.lock
deleted file mode 100644
index d9b0c25d02f2b..0000000000000
--- a/pkgs/build-support/rust/sysroot/Cargo.lock
+++ /dev/null
@@ -1,44 +0,0 @@
-# This file is automatically @generated by Cargo.
-# It is not intended for manual editing.
-version = 3
-
-[[package]]
-name = "alloc"
-version = "0.0.0"
-dependencies = [
- "compiler_builtins",
- "core",
-]
-
-[[package]]
-name = "compiler_builtins"
-version = "0.1.87"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f867ce54c09855ccd135ad4a50c777182a0c7af5ff20a8f537617bd648b10d50"
-dependencies = [
- "rustc-std-workspace-core",
-]
-
-[[package]]
-name = "core"
-version = "0.0.0"
-
-[[package]]
-name = "nixpkgs-sysroot-stub-crate"
-version = "0.0.0"
-dependencies = [
- "alloc",
- "compiler_builtins",
- "core",
-]
-
-[[package]]
-name = "rustc-std-workspace-core"
-version = "1.99.0"
-dependencies = [
- "core",
-]
-
-[[patch.unused]]
-name = "rustc-std-workspace-alloc"
-version = "1.99.0"
diff --git a/pkgs/build-support/rust/sysroot/cargo.py b/pkgs/build-support/rust/sysroot/cargo.py
deleted file mode 100644
index 9d970eff79e88..0000000000000
--- a/pkgs/build-support/rust/sysroot/cargo.py
+++ /dev/null
@@ -1,47 +0,0 @@
-import os
-import toml
-
-rust_src = os.environ['RUSTC_SRC']
-orig_cargo = os.environ['ORIG_CARGO'] if 'ORIG_CARGO' in os.environ else None
-
-base = {
-  'package': {
-    'name': 'nixpkgs-sysroot-stub-crate',
-    'version': '0.0.0',
-    'authors': ['The Rust Project Developers'],
-    'edition': '2018',
-  },
-  'dependencies': {
-    'compiler_builtins': {
-      'version': '0.1.0',
-      'features': ['rustc-dep-of-std', 'mem'],
-    },
-    'core': {
-      'path': os.path.join(rust_src, 'core'),
-    },
-    'alloc': {
-      'path': os.path.join(rust_src, 'alloc'),
-    },
-  },
-  'patch': {
-    'crates-io': {
-      'rustc-std-workspace-core': {
-        'path': os.path.join(rust_src, 'rustc-std-workspace-core'),
-      },
-      'rustc-std-workspace-alloc': {
-        'path': os.path.join(rust_src, 'rustc-std-workspace-alloc'),
-      },
-    },
-  },
-}
-
-if orig_cargo is not None:
-  with open(orig_cargo, 'r') as f:
-    src = toml.loads(f.read())
-    if 'profile' in src:
-      base['profile'] = src['profile']
-
-out = toml.dumps(base)
-
-with open('Cargo.toml', 'x') as f:
-  f.write(out)
diff --git a/pkgs/build-support/rust/sysroot/src.nix b/pkgs/build-support/rust/sysroot/src.nix
deleted file mode 100644
index d41cbf55fcdcf..0000000000000
--- a/pkgs/build-support/rust/sysroot/src.nix
+++ /dev/null
@@ -1,31 +0,0 @@
-{
-  lib,
-  stdenv,
-  rustPlatform,
-  buildPackages,
-  originalCargoToml ? null,
-}:
-
-stdenv.mkDerivation {
-  name = "cargo-src";
-  preferLocalBuild = true;
-
-  unpackPhase = "true";
-  dontConfigure = true;
-  dontBuild = true;
-
-  installPhase =
-    ''
-      export RUSTC_SRC=${rustPlatform.rustLibSrc.override { }}
-    ''
-    + lib.optionalString (originalCargoToml != null) ''
-      export ORIG_CARGO=${originalCargoToml}
-    ''
-    + ''
-      ${buildPackages.python3.withPackages (ps: with ps; [ toml ])}/bin/python3 ${./cargo.py}
-      mkdir -p $out/src
-      echo '#![no_std]' > $out/src/lib.rs
-      cp Cargo.toml $out/Cargo.toml
-      cp ${./Cargo.lock} $out/Cargo.lock
-    '';
-}
diff --git a/pkgs/build-support/rust/sysroot/update-lockfile.sh b/pkgs/build-support/rust/sysroot/update-lockfile.sh
deleted file mode 100755
index d0596d1e5a623..0000000000000
--- a/pkgs/build-support/rust/sysroot/update-lockfile.sh
+++ /dev/null
@@ -1,27 +0,0 @@
-#!/usr/bin/env nix-shell
-#!nix-shell -i bash -p python3 python3.pkgs.toml cargo
-
-set -eu pipefile
-
-HERE=$(readlink -e $(dirname "${BASH_SOURCE[0]}"))
-NIXPKGS_ROOT="$HERE/../../../.."
-
-# https://unix.stackexchange.com/a/84980/390173
-tempdir=$(mktemp -d 2>/dev/null || mktemp -d -t 'update-lockfile')
-cd "$tempdir"
-mkdir -p src
-touch src/lib.rs
-
-RUSTC_SRC=$(nix-build "${NIXPKGS_ROOT}" -A pkgs.rustPlatform.rustLibSrc --no-out-link)
-
-ln -s $RUSTC_SRC/{core,alloc} ./
-
-export RUSTC_SRC
-python3 "$HERE/cargo.py"
-
-export RUSTC_BOOTSTRAP=1
-cargo generate-lockfile
-
-cp Cargo.lock "$HERE"
-
-rm -rf "$tempdir"