diff --git a/keccak/src/lib.rs b/keccak/src/lib.rs
index 349979e..10a0c39 100644
--- a/keccak/src/lib.rs
+++ b/keccak/src/lib.rs
@@ -71,6 +71,8 @@ impl Keccak {
                 return f.call_once::<aarch64_sha3::Backend>()
             } else if #[cfg(keccak_backend = "soft")] {
                 return f.call_once::<soft::Backend>()
+            } else if #[cfg(target_os = "zkvm")] {
+                return f.call_once::<risc0::Backend>()
             }
         );