diff --git a/rust/hgcli/pyoxidizer.bzl b/rust/hgcli/pyoxidizer.bzl
--- a/rust/hgcli/pyoxidizer.bzl
+++ b/rust/hgcli/pyoxidizer.bzl
@@ -122,7 +122,7 @@
     )
 
     # Add Mercurial to resources.
-    exe.add_python_resources(exe.pip_install(["--verbose", ROOT]))
+    exe.add_python_resources(exe.pip_install(["--verbose", "--no-use-pep517", ROOT]))
 
     # On Windows, we install extra packages for convenience.
     if IS_WINDOWS: