diff --git a/src/ed25519.rs b/src/ed25519.rs
index 4f9665b..4a505b5 100644
--- a/src/ed25519.rs
+++ b/src/ed25519.rs
@@ -498,7 +498,7 @@ mod bench {
     use super::*;
 
     /// A fake RNG which simply returns zeroes.
-    pub struct ZeroRng;
+    struct ZeroRng;
 
     impl ZeroRng {
         pub fn new() -> ZeroRng {