diff --git a/carculator_truck/inventory.py b/carculator_truck/inventory.py
index 8d686f7..063c41b 100644
--- a/carculator_truck/inventory.py
+++ b/carculator_truck/inventory.py
@@ -1,13 +1,14 @@
 """
 inventory.py contains Inventory which provides all methods to solve inventories.
 """
+import warnings
 
 import numpy as np
 from carculator_utils.inventory import Inventory
 
 from . import DATA_DIR
 
-np.warnings.filterwarnings("ignore", category=np.VisibleDeprecationWarning)
+warnings.filterwarnings("ignore", category=np.VisibleDeprecationWarning)
 
 IAM_FILES_DIR = DATA_DIR / "IAM"