diff --git a/tox.ini b/tox.ini
index 7a6b652f..a22cb896 100644
--- a/tox.ini
+++ b/tox.ini
@@ -40,7 +40,7 @@ extras = dev
 commands =
     mypy -p libp2p -p examples --config-file {toxinidir}/mypy.ini
     black --check libp2p tests tests_interop examples setup.py
-    isort --recursive --check-only libp2p tests tests_interop examples setup.py
+    isort --recursive --check-only --diff libp2p tests tests_interop examples setup.py
     flake8 libp2p tests tests_interop examples setup.py
 
 [testenv:py37-interop]