diff --git a/src/nemos/basis/_transformer_basis.py b/src/nemos/basis/_transformer_basis.py
index 91865028..c2b5f51b 100644
--- a/src/nemos/basis/_transformer_basis.py
+++ b/src/nemos/basis/_transformer_basis.py
@@ -100,14 +100,11 @@ def _unpack_inputs(self, X: FeatureMatrix) -> List:
 
         """
         n_samples = X.shape[0]
-        out = []
-        cc = 0
-        for i, bas in enumerate(self._list_components()):
-            n_input = self._n_basis_input_[i]
-            out.append(
-                np.reshape(X[:, cc : cc + n_input], (n_samples, *bas._input_shape_))
-            )
-            cc += n_input
+        out = [
+            np.reshape(X[:, cc: cc + n_input], (n_samples, *bas._input_shape_))
+            for i, (bas, n_input) in enumerate(zip(self._list_components(), self._n_basis_input_))
+            for cc in [sum(self._n_basis_input_[:i])]
+        ]
         return out
 
     def fit(self, X: FeatureMatrix, y=None):