diff --git a/debian/rules b/debian/rules
index 6606b2c..22c16a3 100755
--- a/debian/rules
+++ b/debian/rules
@@ -7,9 +7,9 @@ export PYBUILD_NAME=pytest-mock
 # The --assert=plain is needed to skip four tests; see
 # https://github.com/pytest-dev/pytest-mock/issues/102
 # for more information.
-export PYBUILD_BEFORE_TEST=cp -r {dir}/src/*.egg-info {build_dir}
+export PYBUILD_BEFORE_TEST={interpreter} setup.py egg_info && cp -r {dir}/src/*.egg-info {build_dir}
 export PYBUILD_TEST_ARGS=--assert=plain {dir}/tests
-export PYBUILD_AFTER_TEST=rm -rf {build_dir}/*.egg-info
+export PYBUILD_AFTER_TEST=rm -rf {build_dir}/*.egg-info {dir}/src/*.egg-info
 
 ifeq (,$(findstring nodoc,$(DEB_BUILD_OPTIONS)))
 %: