diff --git a/src/sizes.rs b/src/sizes.rs
index d8b73e4..06b1419 100644
--- a/src/sizes.rs
+++ b/src/sizes.rs
@@ -21,10 +21,7 @@ pub const PACKET_SIZE: usize = 64;
 /// The theoretical maximal message size, which however is far
 /// too large for most platforms.
 pub const THEORETICAL_MAX_MESSAGE_SIZE: usize = PACKET_SIZE - 7 + 128 * (PACKET_SIZE - 5);
-/// The size used by Yubico, which means that no platforms will
-/// realistically expect a larger size.
-pub const REALISTIC_MAX_MESSAGE_SIZE: usize = 1200;
 
 /// Max length for a large blob fragment, according to
 /// https://fidoalliance.org/specs/fido-v2.1-ps-20210615/fido-client-to-authenticator-protocol-v2.1-ps-20210615.html#largeBlobsRW
-pub const LARGE_BLOB_MAX_FRAGMENT_LENGTH: usize = REALISTIC_MAX_MESSAGE_SIZE - 64;
+pub const LARGE_BLOB_MAX_FRAGMENT_LENGTH: usize = 1200 - 64;