diff --git a/contracts/verifiers/FflonkVerifier.sol b/contracts/verifiers/FflonkVerifier_13.sol
similarity index 99%
rename from contracts/verifiers/FflonkVerifier.sol
rename to contracts/verifiers/FflonkVerifier_13.sol
index 2ea4fa7c..86dbbb51 100644
--- a/contracts/verifiers/FflonkVerifier.sol
+++ b/contracts/verifiers/FflonkVerifier_13.sol
@@ -20,7 +20,7 @@
 
 pragma solidity >=0.7.0 <0.9.0;
 
-contract FflonkVerifier {
+contract FflonkVerifier_13 {
     uint32 constant n     = 16777216; // Domain size
 
     // Verification Key data