diff --git a/src/maml/apps/gbe/utils.py b/src/maml/apps/gbe/utils.py
index 5adc47ed..a6ee0439 100644
--- a/src/maml/apps/gbe/utils.py
+++ b/src/maml/apps/gbe/utils.py
@@ -75,7 +75,7 @@ def get_b0(bulk_structure: Structure) -> float:
     for d in data_source:
         if d["pretty_formula"] in b0_dict:
             continue
-        bs = rester.get_structure_by_material_id(d["material_id"])
+        bs = rester.get_structure_by_material_id(d["material_id"])  # type: ignore
         b0 = get_b0(bs)
         b0_dict.update({d["pretty_formula"]: b0})
     return b0_dict