diff --git a/src/lib.rs b/src/lib.rs
index 215905c..7d44ab0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,7 +1,7 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
 mod error;
-mod helper;
+pub mod helper;
 mod merge;
 mod mmr;
 mod mmr_store;