diff --git a/zebra-chain/src/sapling/keys.rs b/zebra-chain/src/sapling/keys.rs
index 81a199ca3..8bac9e27e 100644
--- a/zebra-chain/src/sapling/keys.rs
+++ b/zebra-chain/src/sapling/keys.rs
@@ -47,7 +47,7 @@ use crate::{
 ///
 /// [0]: https://docs.rs/zcash_primitives/0.2.0/zcash_primitives/constants/constant.GH_FIRST_BLOCK.html
 /// [1]: https://zips.z.cash/protocol/protocol.pdf#beacon
-pub const RANDOMNESS_BEACON_URS: &[u8; 64] =
+pub(super) const RANDOMNESS_BEACON_URS: &[u8; 64] =
     b"096b36a5804bfacef1691e173c366a47ff5ba84a44f26ddd7e8d9f79d5b42df0";
 
 /// Invokes Blake2b-512 as PRF^expand with parameter t, to derive a