diff --git a/setup.cfg b/setup.cfg
index a4f2d8e4b..a62c9d665 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -32,7 +32,7 @@ project_urls =
     Source Code = https://github.com/borgbackup/borg
 
 [options]
-packages = find:
+packages = find_namespace:
 package_dir =
     =src
 python_requires = >=3.9
diff --git a/src/borg/cache_sync/__init__.py b/src/borg/cache_sync/__init__.py
deleted file mode 100644
index cb2d1a50f..000000000
--- a/src/borg/cache_sync/__init__.py
+++ /dev/null
@@ -1,23 +0,0 @@
-"""
-dummy package init file to suppress this weird setuptools warning:
-
-$ pip install -v .  # note: does not happen with -ve .
-
-############################
-# Package would be ignored #
-############################
-Python recognizes 'borg.cache_sync' as an importable package,
-but it is not listed in the `packages` configuration of setuptools.
-
-'borg.cache_sync' has been automatically added to the distribution only
-because it may contain data files, but this behavior is likely to change
-in future versions of setuptools (and therefore is considered deprecated).
-
-Please make sure that 'borg.cache_sync' is included as a package by using
-the `packages` configuration field or the proper discovery methods
-(for example by using `find_namespace_packages(...)`/`find_namespace:`
-instead of `find_packages(...)`/`find:`).
-
-You can read more about "package discovery" and "data files" on setuptools
-documentation page.
-"""