diff --git a/pymatgen/io/vasp/outputs.py b/pymatgen/io/vasp/outputs.py
index 6d1e6a824ec..c944f2cd246 100644
--- a/pymatgen/io/vasp/outputs.py
+++ b/pymatgen/io/vasp/outputs.py
@@ -1219,7 +1219,7 @@ def update_charge_from_potcar(self, path: PathLike | bool) -> None:
         """
         potcar = self.get_potcars(path)
 
-        if potcar and self.incar.get("ALGO", "") not in {"GW0", "G0W0", "GW", "BSE"}:
+        if potcar and self.incar.get("ALGO", "").upper() not in {"GW0", "G0W0", "GW", "BSE"}:
             nelect = self.parameters["NELECT"]
             if len(potcar) == len(self.initial_structure.composition.element_composition):
                 potcar_nelect = sum(