diff --git a/models/models.py b/models/models.py
index 085b530..afa0942 100644
--- a/models/models.py
+++ b/models/models.py
@@ -20,7 +20,7 @@ def __call__(
 
         # Use standard coordinate tensor if none is given
         if coordinate_tensor is None:
-            coordinate_tensor = self.make_coordinate_slice(
+            coordinate_tensor = general.make_coordinate_slice(
                 output_shape, dimension, slice_pos
             )