diff --git a/setup.cfg b/setup.cfg
index 0e1586b..56606f3 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -41,6 +41,8 @@ include = cocotbext.*
 [tool:pytest]
 testpaths =
     tests
+addopts =
+    --import-mode importlib
 
 # tox configuration
 [tox:tox]