diff --git a/mercurial/utils/procutil.py b/mercurial/utils/procutil.py
--- a/mercurial/utils/procutil.py
+++ b/mercurial/utils/procutil.py
@@ -654,9 +654,13 @@
                 stdin.write(stdin_bytes)
                 stdin.flush()
                 stdin.seek(0)
+            if shell:
+                script = tonativestr(script)
+            else:
+                script = [tonativestr(s) for s in script]
 
             p = subprocess.Popen(
-                tonativestr(script),
+                script,
                 shell=shell,
                 env=tonativeenv(env),
                 close_fds=True,