diff --git a/grid2op/Chronics/multifolderWithCache.py b/grid2op/Chronics/multifolderWithCache.py
index ed4217d2..a2b04c80 100644
--- a/grid2op/Chronics/multifolderWithCache.py
+++ b/grid2op/Chronics/multifolderWithCache.py
@@ -291,7 +291,7 @@ def seed(self, seed : int):
         """
         res = super().seed(seed)
         max_int = np.iinfo(dt_int).max
-        self._cached_seeds = np.empty(len(shape=self._cached_data), dtype=dt_int)
+        self._cached_seeds = np.empty(len(self._cached_data), dtype=dt_int)
         for i in self._order:
             data = self._cached_data[i]
             seed_ts = self.space_prng.randint(max_int)