diff --git a/src/controllers/BaseController.sol b/src/controllers/BaseController.sol
index 36a30dd..7750d45 100644
--- a/src/controllers/BaseController.sol
+++ b/src/controllers/BaseController.sol
@@ -23,6 +23,8 @@ abstract contract BaseController is Ownable, Oval {
      * @param allowed The unlocker status to set.
      */
     function setUnlocker(address unlocker, bool allowed) public onlyOwner {
+        require(unlockers[unlocker] != allowed, "Unlocker not changed");
+
         unlockers[unlocker] = allowed;
 
         emit UnlockerSet(unlocker, allowed);
diff --git a/src/controllers/MutableUnlockersController.sol b/src/controllers/MutableUnlockersController.sol
index a7acf13..4dd3e3d 100644
--- a/src/controllers/MutableUnlockersController.sol
+++ b/src/controllers/MutableUnlockersController.sol
@@ -36,6 +36,8 @@ abstract contract MutableUnlockersController is Ownable, Oval {
      * @param allowed The unlocker status to set.
      */
     function setUnlocker(address unlocker, bool allowed) public onlyOwner {
+        require(unlockers[unlocker] != allowed, "Unlocker not changed");
+
         unlockers[unlocker] = allowed;
 
         emit UnlockerSet(unlocker, allowed);