diff --git a/sbi/inference/trainers/base.py b/sbi/inference/trainers/base.py
index 46238ecb6..558ee1c71 100644
--- a/sbi/inference/trainers/base.py
+++ b/sbi/inference/trainers/base.py
@@ -678,13 +678,13 @@ def _raise_deprecation_warning(
 
         # Check if deprecated parameters are used
         if (
-            kwargs.get("mcmc_method") == default_mcmc_method
-            or kwargs.get("mcmc_method") is None
+            kwargs.get("mcmc_method") is not None
+            and kwargs.get("mcmc_method") != default_mcmc_method
         ):
             deprecated_params.append("mcmc_method")
         if (
-            kwargs.get("vi_method") == default_vi_method
-            or kwargs.get("vi_method") is None
+            kwargs.get("vi_method") is not None
+            and kwargs.get("vi_method") != default_vi_method
         ):
             deprecated_params.append("vi_method")
 
diff --git a/tests/linearGaussian_vector_field_test.py b/tests/linearGaussian_vector_field_test.py
index 1184c7677..e9e5cc486 100644
--- a/tests/linearGaussian_vector_field_test.py
+++ b/tests/linearGaussian_vector_field_test.py
@@ -350,12 +350,7 @@ def test_vector_field_sde_ode_sampling_equivalence(vector_field_trained_model):
 @pytest.mark.parametrize(
     "iid_method, num_trial",
     [
-        pytest.param(
-            "fnpe",
-            3,
-            id="fnpe-3trials",
-            marks=pytest.mark.xfail(reason="c2st to high, fixed in PR #1501/1544"),
-        ),
+        pytest.param("fnpe", 3, id="fnpe-3trials"),
         pytest.param("gauss", 3, id="gauss-3trials"),
         pytest.param("auto_gauss", 8, id="auto_gauss-8trials"),
         pytest.param("auto_gauss", 16, id="auto_gauss-16trials"),