diff --git a/emmet-core/emmet/core/vasp/calc_types/enums.py b/emmet-core/emmet/core/vasp/calc_types/enums.py
index 1f2ec6994..d40407560 100644
--- a/emmet-core/emmet/core/vasp/calc_types/enums.py
+++ b/emmet-core/emmet/core/vasp/calc_types/enums.py
@@ -100,7 +100,7 @@ class TaskType(ValueEnum):
     Unrecognized = "Unrecognized"
 
 
-class CalcType(ValueEnum):
+class CalcType(IgnoreCaseEnum):
     """VASP calculation types."""
 
     AM05_DFPT = "AM05 DFPT"