diff --git a/host/tests/common/mod.rs b/host/tests/common/mod.rs
index 132a1c3ec..0e9d22b39 100644
--- a/host/tests/common/mod.rs
+++ b/host/tests/common/mod.rs
@@ -123,7 +123,7 @@ pub async fn make_request() -> anyhow::Result<ProofRequestOpt> {
             "8008500000000000000000000000000000000000000000000000000000000000".to_owned(),
         ),
         prover: Some("0x70997970C51812dc3A010C7d01b50e0d17dc79C8".to_owned()),
-        proof_type: Some(proof_type),
+        proof_type: Some(proof_type.to_string()),
         blob_proof_type: Some("kzg_versioned_hash".to_string()),
         prover_args: ProverSpecificOpts {
             native: None,