diff --git a/exercises/message/src/starks/prover.rs b/exercises/message/src/starks/prover.rs
index 12fbcad471..c191cbf75c 100644
--- a/exercises/message/src/starks/prover.rs
+++ b/exercises/message/src/starks/prover.rs
@@ -744,11 +744,6 @@ where
         .collect()
 }
 
-strct StoneProverTranscript {
-    counter: usize,
-    spare_bytes: Vec<u8>,
-    hash: dyn Transcript,
-}
 
 // FIXME remove unwrap() calls and return errors
 pub fn prove<F, A>(