diff --git a/schwarz/__init__.py b/schwarz/__init__.py
deleted file mode 100644
index de40ea7..0000000
--- a/schwarz/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__import__('pkg_resources').declare_namespace(__name__)
diff --git a/setup.cfg b/setup.cfg
index e66e009..1ae4cb5 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -47,7 +47,7 @@ testing =
     dotmap; python_version >= '3.0'
     # Even the oldest versions of "time-machine" support only Python 3.6+
     freezegun < 1.0             ; python_version < '3.0'
-    freezegun                   ; python_implementation == 'PyPy' and python_version > '3.0'
+    freezegun                   ; implementation_name == 'pypy' and python_version > '3.0'
     time-machine                ; python_version > '3.0'
     mock                        ; python_version < '3.0'
     pytest