diff --git a/cibuildwheel/__main__.py b/cibuildwheel/__main__.py
index f7753b87..e171ab20 100644
--- a/cibuildwheel/__main__.py
+++ b/cibuildwheel/__main__.py
@@ -220,7 +220,6 @@ def main() -> None:
 
     # Python is buffering by default when running on the CI platforms, giving problems interleaving subprocess call output with unflushed calls to 'print'
     sys.stdout = Unbuffered(sys.stdout)  # type: ignore
-    # sys.stderr = Unbuffered(sys.stderr)  # type: ignore
 
     print_preamble(platform, build_options)
 
diff --git a/cibuildwheel/macos.py b/cibuildwheel/macos.py
index e2cddb6e..eb5ce5aa 100644
--- a/cibuildwheel/macos.py
+++ b/cibuildwheel/macos.py
@@ -22,8 +22,7 @@ def call(args: Union[str, Sequence[Union[str, PathLike]]], env: Optional[Dict[st
     else:
         print('+ ' + ' '.join(shlex.quote(str(a)) for a in args))
 
-    # run the process. Subprocess stderr is routed to stdout to keep output interleaved
-    return subprocess.check_call(args, env=env, cwd=cwd, shell=shell, stderr=subprocess.STDOUT)
+    return subprocess.check_call(args, env=env, cwd=cwd, shell=shell)
 
 
 class PythonConfiguration(NamedTuple):
diff --git a/cibuildwheel/windows.py b/cibuildwheel/windows.py
index 4532e1bb..f9997927 100644
--- a/cibuildwheel/windows.py
+++ b/cibuildwheel/windows.py
@@ -25,13 +25,12 @@ def call(args: Sequence[Union[str, PathLike]], env: Optional[Dict[str, str]] = N
     print('+ ' + ' '.join(str(a) for a in args))
     # we use shell=True here, even though we don't need a shell due to a bug
     # https://bugs.python.org/issue8557
-    subprocess.check_call([str(a) for a in args], env=env, cwd=cwd, shell=True, stderr=subprocess.STDOUT)
+    subprocess.check_call([str(a) for a in args], env=env, cwd=cwd, shell=True)
 
 
 def shell(command: str, env: Optional[Dict[str, str]] = None, cwd: Optional[str] = None) -> None:
     print(f'+ {command}')
-    # route stderr to stdout so output remains interleaved
-    subprocess.check_call(command, env=env, cwd=cwd, shell=True, stderr=subprocess.STDOUT)
+    subprocess.check_call(command, env=env, cwd=cwd, shell=True)
 
 
 def get_nuget_args(version: str, arch: str) -> List[str]: