diff --git a/brian2modelfitting/tests/test_modelfitting_tracefitter.py b/brian2modelfitting/tests/test_modelfitting_tracefitter.py
index de96e11c..6682bd45 100644
--- a/brian2modelfitting/tests/test_modelfitting_tracefitter.py
+++ b/brian2modelfitting/tests/test_modelfitting_tracefitter.py
@@ -103,6 +103,8 @@ def fin():
 
 @pytest.fixture
 def setup_standalone(request):
+    # Workaround to avoid issues with Network instances still around
+    Network.__instances__().clear()
     set_device('cpp_standalone', directory=None)
     dt = 0.01 * ms
     tf = TraceFitter(dt=dt,
diff --git a/brian2modelfitting/tests/test_simulation_standalone.py b/brian2modelfitting/tests/test_simulation_standalone.py
index a612542e..7b67a15e 100644
--- a/brian2modelfitting/tests/test_simulation_standalone.py
+++ b/brian2modelfitting/tests/test_simulation_standalone.py
@@ -42,6 +42,8 @@ def fin():
 
 @pytest.fixture()
 def setup_standalone(request):
+    # Workaround to avoid issues with Network instances still around
+    Network.__instances__().clear()
     set_device('cpp_standalone', directory=None)
     dt = 0.1 * ms
     duration = 10 * ms