diff --git a/mikeio/dataset/_dataset.py b/mikeio/dataset/_dataset.py
index a55776616..49f452aad 100644
--- a/mikeio/dataset/_dataset.py
+++ b/mikeio/dataset/_dataset.py
@@ -561,7 +561,7 @@ def __set_or_insert_item(self, key, value, insert=False):
             self._data_vars[key] = value
             self._set_name_attr(key, value)
 
-    def insert(self, key: int, value: DataArray):
+    def insert(self, key, value: DataArray):
         """Insert DataArray in a specific position
 
         Parameters