diff --git a/tests/conftest.py b/tests/conftest.py
index fa4dc80..0433e3c 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -13,21 +13,21 @@
 
 
 NAME2BACKEND = {
-    "tensorflow": TensorflowBackend(),
-    "pytorch": PyTorchBackend(),
-    "jax": JaxBackend(),
+    "tensorflow": TensorflowBackend,
+    "pytorch": PyTorchBackend,
+    "jax": JaxBackend,
 }
 
 
 @pytest.fixture
 def backend(backend_name):
-    yield NAME2BACKEND[backend_name]
+    yield NAME2BACKEND[backend_name]()
 
 
 AVAILABLE_BACKENDS = []
 for backend_name in BACKENDS:
     try:
-        _backend = NAME2BACKEND[backend_name]
+        _backend = NAME2BACKEND[backend_name]()
         AVAILABLE_BACKENDS.append(backend_name)
     except (ModuleNotFoundError, ImportError):
         pass
diff --git a/tests/test_backends.py b/tests/test_backends.py
index ca6df37..3fb1276 100644
--- a/tests/test_backends.py
+++ b/tests/test_backends.py
@@ -1,3 +1,5 @@
+import platform
+
 import pytest
 
 from qiboml.backends import MetaBackend
@@ -13,5 +15,6 @@ def test_metabackend_load_error():
 
 
 def test_metabackend_list_available():
-    available_backends = {"tensorflow": True, "pytorch": True, "jax": True}
+    tensorflow = False if platform.system() == "Windows" else True
+    available_backends = {"tensorflow": tensorflow, "pytorch": True, "jax": True}
     assert MetaBackend().list_available() == available_backends