diff --git a/src/store/mod.rs b/src/store/mod.rs
index 52f6ad2..e6537b7 100644
--- a/src/store/mod.rs
+++ b/src/store/mod.rs
@@ -5,5 +5,5 @@ mod id_store;
 pub use id_mapping::{IDMapping, Name};
 pub use id_store::{IDStore,AttendanceDay};
 
-pub type TallyID = [u8; 12];
+pub type TallyID = [u8; 6];
 pub type Date = [u8; 10];