diff --git a/src/matchbox/client/results.py b/src/matchbox/client/results.py
index 95de99dd..b4d38f89 100644
--- a/src/matchbox/client/results.py
+++ b/src/matchbox/client/results.py
@@ -127,7 +127,7 @@ def _check_range(arr: pa.Array, min: float, max: float) -> bool:
                     target_type=pa.uint8(), allow_float_truncate=True
                 ),
             )
-            value.set_column(
+            value = value.set_column(
                 i=value.schema.get_field_index("probability"),
                 field_="probability",
                 column=probability_uint8,
diff --git a/src/matchbox/server/postgresql/orm.py b/src/matchbox/server/postgresql/orm.py
index dc2dc291..a7725e0b 100644
--- a/src/matchbox/server/postgresql/orm.py
+++ b/src/matchbox/server/postgresql/orm.py
@@ -285,5 +285,5 @@ class Probabilities(CountMixin, MBDB.MatchboxBase):
 
     # Constraints
     __table_args__ = (
-        CheckConstraint("probability BETWEEN 0 AND 1", name="valid_probability"),
+        CheckConstraint("probability BETWEEN 0 AND 100", name="valid_probability"),
     )