diff --git a/packages/contracts-bedrock/src/dispute/FaultDisputeGameN.sol b/packages/contracts-bedrock/src/dispute/FaultDisputeGameN.sol
index 8153ab0d464c..c7e00ab3fffa 100644
--- a/packages/contracts-bedrock/src/dispute/FaultDisputeGameN.sol
+++ b/packages/contracts-bedrock/src/dispute/FaultDisputeGameN.sol
@@ -1100,7 +1100,7 @@ contract FaultDisputeGame is IFaultDisputeGame, Clone, ISemver {
         if (ancestorPos_.depth() == SPLIT_DEPTH + N_BITS) {
             ancestorClaim_ = ancestorClaimRoot;
         } else {
-            ancestorClaim_ = getClaim(ancestorClaimRoot.raw(), Position.wrap(_pos.raw() - 1), _daItem);
+            ancestorClaim_ = getClaim(ancestorClaimRoot.raw(), ancestorPos_, _daItem);
         }
     }