diff --git a/core/data/schema/arcade.py b/core/data/schema/arcade.py
index 389532d..fcdd10c 100644
--- a/core/data/schema/arcade.py
+++ b/core/data/schema/arcade.py
@@ -212,7 +212,7 @@ class ArcadeData(BaseData):
         return f"{platform_code}{platform_rev:02d}A{serial_num:04d}{append:04d}"  # 0x41 = A, 0x52 = R
 
     def validate_keychip_format(self, serial: str) -> bool:
-        if re.fullmatch(r"^A[0-9]{2}[E|X][-]?[0-9]{2}[A-HJ-NP-Z][0-9]{4}([0-9]{4})?$", serial) is None:
+        if re.fullmatch(r"^A[0-9]{2}[E|X|C][-]?[0-9]{2}[A-HJ-NP-Z][0-9]{4}([0-9]{4})?$", serial) is None:
             return False
         
         return True