diff --git a/snix/nix-compat/src/nixhash/algos.rs b/snix/nix-compat/src/nixhash/algos.rs
index 1d98eba0a..91410d3dc 100644
--- a/snix/nix-compat/src/nixhash/algos.rs
+++ b/snix/nix-compat/src/nixhash/algos.rs
@@ -15,7 +15,7 @@ pub enum HashAlgo {
 
 impl HashAlgo {
     // return the number of bytes in the digest of the given hash algo.
-    pub fn digest_length(&self) -> usize {
+    pub const fn digest_length(&self) -> usize {
         match self {
             HashAlgo::Sha1 => 20,
             HashAlgo::Sha256 => 32,