diff --git a/pyshield/physics_state.py b/pyshield/physics_state.py
index 977b8fbe..98592f4f 100644
--- a/pyshield/physics_state.py
+++ b/pyshield/physics_state.py
@@ -331,7 +331,7 @@ def init_zeros(
                     _field.metadata["dims"],
                     _field.metadata["units"],
                     dtype=Float,
-                )
+                ).data
         return cls(
             **initial_arrays,
             quantity_factory=quantity_factory,