diff --git a/contracts/switchboard/default-switchboards/FastSwitchboard.sol b/contracts/switchboard/default-switchboards/FastSwitchboard.sol
index 95b9aba4..6d37da97 100644
--- a/contracts/switchboard/default-switchboards/FastSwitchboard.sol
+++ b/contracts/switchboard/default-switchboards/FastSwitchboard.sol
@@ -107,7 +107,7 @@ contract FastSwitchboard is SwitchboardBase {
 
         address watcher = signatureVerifier__.recoverSigner(
             keccak256(
-                abi.encode(address(this), chainSlug, packetId_, proposalCount_)
+                abi.encode(address(this), chainSlug, packetId_, proposalCount_, root_)
             ),
             signature_
         );
diff --git a/test/Setup.t.sol b/test/Setup.t.sol
index 55712024..a2154b61 100644
--- a/test/Setup.t.sol
+++ b/test/Setup.t.sol
@@ -760,7 +760,7 @@ contract Setup is Test {
         uint256 watcherPrivateKey_
     ) internal {
         bytes32 digest = keccak256(
-            abi.encode(switchboardAddress, dstSlug, packetId_, proposalCount_)
+            abi.encode(switchboardAddress, dstSlug, packetId_, proposalCount_, root_)
         );
 
         // generate attest-signature