diff --git a/aeolis/model.py b/aeolis/model.py
index a9dd402d..8c5a0bf8 100644
--- a/aeolis/model.py
+++ b/aeolis/model.py
@@ -61,7 +61,6 @@
 
 # type hints
 from typing import Any, Union, Tuple
-from numpy import ndarray
 
 from aeolis.utils import *
 
@@ -388,7 +387,7 @@ def get_start_time(self) -> float:
 
         return self.p['tstart']
 
-    def get_var(self, var:str) -> Union[ndarray, int, float, str, list]:
+    def get_var(self, var:str) -> Union[np.ndarray, int, float, str, list]:
         '''Returns spatial grid or model configuration parameter
 
         If the given variable name matches with a spatial grid, the
@@ -524,7 +523,7 @@ def inq_compound_field(self) -> None:
         logger.log_and_raise('Method not yet implemented [inq_compound_field]', exc=NotImplementedError)
 
 
-    def set_var(self, var:str, val:Union[ndarray, int, float, str, list]) -> None:
+    def set_var(self, var:str, val:Union[np.ndarray, int, float, str, list]) -> None:
         '''Sets spatial grid or model configuration parameter
 
         If the given variable name matches with a spatial grid, the
@@ -558,7 +557,7 @@ def set_var(self, var:str, val:Union[ndarray, int, float, str, list]) -> None:
             self.p[var] = val
 
 
-    def set_var_index(self, i:int, val:ndarray) -> None:
+    def set_var_index(self, i:int, val:np.ndarray) -> None:
         '''Set spatial grid by index (in alphabetical order)
 
         Parameters
@@ -2556,7 +2555,7 @@ def set_params(self, **kwargs) -> None:
             self.p.update(kwargs)
 
 
-    def get_statistic(self, var:str, stat:str='avg') -> Union[ndarray, None]:
+    def get_statistic(self, var:str, stat:str='avg') -> Union[np.ndarray, None]:
         '''Return statistic of spatial grid
 
         Parameters
@@ -2588,7 +2587,7 @@ def get_statistic(self, var:str, stat:str='avg') -> Union[ndarray, None]:
             return None
 
 
-    def get_var(self, var:str, clear:bool=True) -> Union[ndarray, int, float, str, list]:
+    def get_var(self, var:str, clear:bool=True) -> Union[np.ndarray, int, float, str, list]:
         '''Returns spatial grid, statistic or model configuration parameter
 
         Overloads the :func:`~model.AeoLiS.get_var()` function and
@@ -3098,7 +3097,7 @@ def __init__(self,
         self.MTMcum = np.cumsum(MTM,1)
 
 
-    def __getitem__(self, s:int)-> ndarray:
+    def __getitem__(self, s:int)-> np.ndarray:
         """
         Retrieves item from list of wind speeds as an array