diff --git a/src/fairchem/data/oc/utils/vasp_flags.py b/src/fairchem/data/oc/utils/vasp_flags.py
index dce875df8..fdedd1396 100644
--- a/src/fairchem/data/oc/utils/vasp_flags.py
+++ b/src/fairchem/data/oc/utils/vasp_flags.py
@@ -79,6 +79,7 @@
     "pp": "PBE",
     "lwave": False,
     "lcharg": False,
+    "ncore": 4,
 }
 
 RELAX_FLAGS = {"ibrion": 2, "nsw": 500}