diff --git a/tests/test_models_encodings.py b/tests/test_models_encodings.py
index cd8994df3e..581d1b9e0e 100644
--- a/tests/test_models_encodings.py
+++ b/tests/test_models_encodings.py
@@ -119,11 +119,6 @@ def test_unary_encoder(backend, nqubits, architecture, kind):
         data = sampler.random(nqubits)
         data = backend.cast(data, dtype=data.dtype)
         unary_encoder(data, architecture="semi-diagonal")
-    if architecture == "tree":
-        with pytest.raises(ValueError):
-            data = sampler.random(nqubits + 1)
-            data = backend.cast(data, dtype=data.dtype)
-            unary_encoder(data, architecture=architecture)
 
     # sampling random data in interval [-1, 1]
     sampler = np.random.default_rng(1)