diff --git a/frontends/concrete-python/pytest.ini b/frontends/concrete-python/pytest.ini
index d31cc3211..742501304 100644
--- a/frontends/concrete-python/pytest.ini
+++ b/frontends/concrete-python/pytest.ini
@@ -1,3 +1,4 @@
 [pytest]
 markers =
 	dataflow: mark the test as using dataflow parallelization.
+	graphviz: mark the test using graphviz package