diff --git a/src/bthome_ble/parser.py b/src/bthome_ble/parser.py
index 6834b4c..6feac8a 100644
--- a/src/bthome_ble/parser.py
+++ b/src/bthome_ble/parser.py
@@ -477,7 +477,7 @@ def _decrypt_bthome(self, data: bytes, bthome_mac: bytes, sw_version: int) -> by
             raise ValueError
 
         # check for minimum length of encrypted advertisement
-        if len(data) < (15 if sw_version == 1 else 14):
+        if len(data) < (12 if sw_version == 1 else 11):
             _LOGGER.debug("Invalid data length (for decryption), adv: %s", data.hex())
             raise ValueError