diff --git a/keccak/src/backends.rs b/keccak/src/backends.rs
index 02e050b..c8debb8 100644
--- a/keccak/src/backends.rs
+++ b/keccak/src/backends.rs
@@ -13,6 +13,8 @@ pub(crate) mod aarch64_sha3;
 ))]
 pub(crate) mod simd;
 pub(crate) mod soft;
+#[cfg(target_os = "zkvm")]
+pub(crate) mod risc0;
 
 /// Trait used to define a closure which operates over Keccak backends.
 pub trait BackendClosure {