diff --git a/packages/horizon/contracts/staking/HorizonStaking.sol b/packages/horizon/contracts/staking/HorizonStaking.sol
index 74b2d8d09..76b1860ba 100644
--- a/packages/horizon/contracts/staking/HorizonStaking.sol
+++ b/packages/horizon/contracts/staking/HorizonStaking.sol
@@ -55,7 +55,7 @@ contract HorizonStaking is HorizonStakingBase, IHorizonStakingMain {
      */
     modifier onlyAuthorized(address serviceProvider, address verifier) {
         require(
-            _isAuthorized(msg.sender, serviceProvider, verifier),
+            _isAuthorized(serviceProvider, verifier, msg.sender),
             HorizonStakingNotAuthorized(msg.sender, serviceProvider, verifier)
         );
         _;
@@ -509,7 +509,7 @@ contract HorizonStaking is HorizonStakingBase, IHorizonStakingMain {
         address serviceProvider,
         address verifier
     ) external view override returns (bool) {
-        return _isAuthorized(operator, serviceProvider, verifier);
+        return _isAuthorized(serviceProvider, verifier, operator);
     }
 
     /*
@@ -961,7 +961,7 @@ contract HorizonStaking is HorizonStakingBase, IHorizonStakingMain {
      * @dev Note that this function handles the special case where the verifier is the subgraph data service,
      * where the operator settings are stored in the legacy mapping.
      */
-    function _isAuthorized(address _operator, address _serviceProvider, address _verifier) private view returns (bool) {
+    function _isAuthorized(address _serviceProvider, address _verifier, address _operator) private view returns (bool) {
         if (_operator == _serviceProvider) {
             return true;
         }