diff --git a/doorcontrol/hid/Credential.py b/doorcontrol/hid/Credential.py
index 826f3d0..a05a557 100644
--- a/doorcontrol/hid/Credential.py
+++ b/doorcontrol/hid/Credential.py
@@ -24,6 +24,7 @@ class InvalidParity(InvalidHexCode):
 @dataclasses.dataclass(frozen=True)
 class Credential:
     bits: bitstring.Bits
+    is_26bit: bool = dataclasses.field(default=False, compare=False)
 
     @staticmethod
     def even_parity(bits: bitstring.Bits) -> bool:
@@ -55,16 +56,12 @@ class Credential:
         if bits[31] != (cls.odd_parity(bits)):
             raise InvalidParity(bits, "odd")
 
-        return cls(bits)
+        return cls(bits, is_26bit=True)
 
     @classmethod
-    def from_any_hex(cls, hex_code: str) -> "Credential":
+    def from_raw_hex(cls, hex_code: str) -> "Credential":
         return cls(bitstring.Bits(hex=hex_code))
 
-    @property
-    def is_26bit(self) -> bool:
-        return self.bits[:6].all(0)
-
     @property
     def facility_code(self) -> int:
         if not self.is_26bit:
diff --git a/doorcontrol/tasks/update_doors.py b/doorcontrol/tasks/update_doors.py
index 95a91b1..42307e3 100644
--- a/doorcontrol/tasks/update_doors.py
+++ b/doorcontrol/tasks/update_doors.py
@@ -45,7 +45,7 @@ class DoorMember:
                 )
             )
         if member.nfc_card_number:
-            credentials.add(Credential.from_any_hex(member.nfc_card_number))
+            credentials.add(Credential.from_raw_hex(member.nfc_card_number))
 
         reasons_and_schedules: dict[str, str] = {}
         if (
@@ -107,7 +107,11 @@ class DoorMember:
             },
             cardholderID=data.attrib["cardholderID"],
             credentials={
-                Credential.from_any_hex(c.attrib["rawCardNumber"])
+                (
+                    Credential.from_26bit_hex(c.attrib["rawCardNumber"])
+                    if "formatID" in c.attrib
+                    else Credential.from_raw_hex(c.attrib["rawCardNumber"])
+                )
                 for c in data.findall("{*}Credential")
             },
             schedules={r.attrib["scheduleName"] for r in data.findall("{*}Role")},
@@ -237,7 +241,11 @@ def update_door(door: Door, dry_run: bool = False):
 
     logger.debug(f"Fetching credentials from {door}")
     existing_door_credentials = {
-        Credential.from_any_hex(c.attrib["rawCardNumber"])
+        (
+            Credential.from_26bit_hex(c.attrib["rawCardNumber"])
+            if "formatID" in c.attrib
+            else Credential.from_raw_hex(c.attrib["rawCardNumber"])
+        )
         for c in door.controller.get_credentials()
     }