diff --git a/zcash_primitives/src/merkle_tree.rs b/zcash_primitives/src/merkle_tree.rs
index 3b4af3a..2dcc5cc 100644
--- a/zcash_primitives/src/merkle_tree.rs
+++ b/zcash_primitives/src/merkle_tree.rs
@@ -1,7 +1,6 @@
 //! Implementation of a Merkle tree of commitments used to prove the existence of notes.
 
 use byteorder::{LittleEndian, ReadBytesExt};
-use sapling_crypto::circuit::sapling::TREE_DEPTH;
 use std::collections::VecDeque;
 use std::io::{self, Read, Write};
 use std::iter;
@@ -435,10 +434,10 @@ impl<Node: Hashable> CommitmentTreeWitness<Node> {
 
     /// Reads a witness from its serialized form.
     pub fn from_slice(witness: &[u8]) -> Result<Self, ()> {
-        Self::from_slice_with_depth(witness, TREE_DEPTH)
+        Self::from_slice_with_depth(witness, SAPLING_COMMITMENT_TREE_DEPTH)
     }
 
-    pub fn from_slice_with_depth(mut witness: &[u8], depth: usize) -> Result<Self, ()> {
+    fn from_slice_with_depth(mut witness: &[u8], depth: usize) -> Result<Self, ()> {
         // Skip the first byte, which should be "depth" to signify the length of
         // the following vector of Pedersen hashes.
         if witness[0] != depth as u8 {
diff --git a/zcash_primitives/src/sapling.rs b/zcash_primitives/src/sapling.rs
index 517d9fd..0ee808c 100644
--- a/zcash_primitives/src/sapling.rs
+++ b/zcash_primitives/src/sapling.rs
@@ -14,7 +14,8 @@ use std::io::{self, Read, Write};
 use crate::merkle_tree::Hashable;
 use JUBJUB;
 
-pub(crate) const SAPLING_COMMITMENT_TREE_DEPTH: usize = 32;
+pub(crate) const SAPLING_COMMITMENT_TREE_DEPTH: usize =
+    sapling_crypto::circuit::sapling::TREE_DEPTH;
 
 /// Compute a parent node in the Sapling commitment tree given its two children.
 pub fn merkle_hash(depth: usize, lhs: &FrRepr, rhs: &FrRepr) -> FrRepr {