diff --git a/src/gpgi/_data_types.py b/src/gpgi/_data_types.py
index d5bf5cf..24a8f22 100644
--- a/src/gpgi/_data_types.py
+++ b/src/gpgi/_data_types.py
@@ -185,7 +185,7 @@ def cell_edges(self) -> FieldMap[FloatT]:
     @cached_property
     def cell_centers(self) -> FieldMap[FloatT]:
         r"""The positions of cell centers in each direction."""
-        return {ax: 0.5 * (arr[1:] + arr[:-1]) for ax, arr in self.coordinates.items()}
+        return {ax: 0.5 * (arr[1:] + arr[:-1]) for ax, arr in self.coordinates.items()}  # type: ignore [misc]
 
     @cached_property
     def cell_widths(self) -> FieldMap[FloatT]: