diff --git a/setup.cfg b/setup.cfg
index 1be1612..a27d659 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -40,6 +40,8 @@ include = cocotbext.*
 [tool:pytest]
 testpaths =
     tests
+addopts =
+    --import-mode importlib
 
 # tox configuration
 [tox:tox]
@@ -54,7 +56,7 @@ python =
 
 [testenv]
 setenv =
-    COVERAGE=1 
+    COVERAGE=1
 
 deps =
     pytest