diff --git a/src/challenge/ChallengeManager.sol b/src/challenge/ChallengeManager.sol
index a77856a..133ab1e 100644
--- a/src/challenge/ChallengeManager.sol
+++ b/src/challenge/ChallengeManager.sol
@@ -116,7 +116,6 @@ contract ChallengeManager is DelegateCallAware, IChallengeManager {
         bytes32 condRoot,
         IOneStepProofEntry condOsp
     ) external onlyDelegated onlyProxyOwner {
-        emit ConditonalOSPSet(condRoot, condOsp);
         ospCond[condRoot] = condOsp;
         osp = osp_;
     }
diff --git a/src/challenge/IChallengeManager.sol b/src/challenge/IChallengeManager.sol
index 60f44c5..236829b 100644
--- a/src/challenge/IChallengeManager.sol
+++ b/src/challenge/IChallengeManager.sol
@@ -39,7 +39,6 @@ interface IChallengeManager {
     event OneStepProofCompleted(uint64 indexed challengeIndex);
 
     event ChallengeEnded(uint64 indexed challengeIndex, ChallengeTerminationType kind);
-    event ConditonalOSPSet(bytes32 indexed wasmModuleRoot, IOneStepProofEntry osp_);
 
     function initialize(
         IChallengeResultReceiver resultReceiver_,