diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ffa77ab5..2e27089d3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,7 @@
 - Fix path for dask scheduler file (#1055).
 - Add OrdinalHyperparameter for random forest imputer (#1065).
 - Configurations that fail to become incumbents will be added to the rejected lists (#1069).
+- SMAC RandomForest doesn't crash when `np.integer` used, i.e. as generated from a `np.random.RandomState` (#1084).
 
 # 2.0.2
 
diff --git a/smac/model/random_forest/random_forest.py b/smac/model/random_forest/random_forest.py
index 6d7840d2a..634e0af06 100644
--- a/smac/model/random_forest/random_forest.py
+++ b/smac/model/random_forest/random_forest.py
@@ -87,7 +87,9 @@ def __init__(
         self._rf_opts.compute_law_of_total_variance = False
         self._rf: BinaryForest | None = None
         self._log_y = log_y
-        self._rng = regression.default_random_engine(seed)
+
+        # Case to `int` incase we get an `np.integer` type
+        self._rng = regression.default_random_engine(int(seed))
 
         self._n_trees = n_trees
         self._n_points_per_tree = n_points_per_tree