diff --git a/dev-util/mock/mock-5.3.ebuild b/dev-util/mock/mock-5.3.ebuild
index e8d27cf57e..0aa46fb218 100644
--- a/dev-util/mock/mock-5.3.ebuild
+++ b/dev-util/mock/mock-5.3.ebuild
@@ -83,7 +83,7 @@ src_install() {
 }
 
 src_test() {
-	epytest tests
+	PYTHONPATH=py epytest tests
 }
 
 pkg_postinst() {