diff --git a/mrmustard/lab_dev/sampler.py b/mrmustard/lab_dev/sampler.py
index d122348e1..b4e0828cf 100644
--- a/mrmustard/lab_dev/sampler.py
+++ b/mrmustard/lab_dev/sampler.py
@@ -88,7 +88,7 @@ def probabilities(self, state: State | None = None) -> list[float] | None:
                 state.probability if isinstance(state, State) else math.real(state)
                 for state in states
             ]
-            return probs
+            return probs / sum(probs)
         return self.prob_dist
 
     def sample(self, state: State | None = None, n_samples: int = 1000) -> list[any]:
@@ -134,6 +134,10 @@ class PNRSampler(Sampler):
     def __init__(self, modes: Sequence[int], cutoff: int) -> None:
         super().__init__(list(range(cutoff)), [Number(modes, n) for n in range(cutoff)])
 
+    def probabilities(self, state: State | None = None) -> list[float] | None:
+        fock_state = state.to_fock() if state else state
+        return super().probabilities(fock_state)
+
 
 class HomodyneSampler(Sampler):
     r"""
diff --git a/tests/test_lab_dev/test_sampler.py b/tests/test_lab_dev/test_sampler.py
index 288aa3474..5734631a3 100644
--- a/tests/test_lab_dev/test_sampler.py
+++ b/tests/test_lab_dev/test_sampler.py
@@ -55,7 +55,7 @@ def test_probabilities(self):
         assert sampler2.probabilities() is None
 
         state = Vacuum([0])
-        assert sampler2.probabilities(state) == [1, 0, 0]
+        assert all(sampler2.probabilities(state) == [1, 0, 0])
 
         with pytest.raises(ValueError, match="incompatible"):
             sampler_two_mode = Sampler(
@@ -88,8 +88,8 @@ def test_probabilities(self):
         sampler = PNRSampler([0, 1], cutoff=10)
         vac_prob = [1.0] + [0.0] * 9
         assert sampler.probabilities() is None
-        assert sampler.probabilities(Vacuum([0, 1])) == vac_prob
-        assert sampler.probabilities(Vacuum([0, 1, 2])) == vac_prob
+        assert all(sampler.probabilities(Vacuum([0, 1])) == vac_prob)
+        assert all(sampler.probabilities(Vacuum([0, 1, 2])) == vac_prob)
 
 
 class TestHomodyneSampler: