diff --git a/sklego/meta/decay_estimator.py b/sklego/meta/decay_estimator.py
index a529f1a4..41a53985 100644
--- a/sklego/meta/decay_estimator.py
+++ b/sklego/meta/decay_estimator.py
@@ -124,7 +124,7 @@ def fit(self, X, y):
         """
 
         if self.check_input:
-            X, y = validate_data(self, X=X, y=y, dtype=FLOAT_DTYPES, reset=True)
+            X, y = validate_data(self, X=X, y=y, dtype=FLOAT_DTYPES, accept_sparse=True, reset=True)
         else:
             _check_n_features(self, X, reset=True)