diff --git a/operators/multiclusterobservability/controllers/placementrule/placementrule_controller.go b/operators/multiclusterobservability/controllers/placementrule/placementrule_controller.go
index 0450d336f..b11c83812 100644
--- a/operators/multiclusterobservability/controllers/placementrule/placementrule_controller.go
+++ b/operators/multiclusterobservability/controllers/placementrule/placementrule_controller.go
@@ -62,7 +62,6 @@ var (
 	defaultAddonDeploymentConfig  = &addonv1alpha1.AddOnDeploymentConfig{}
 	isplacementControllerRunnning = false
 	managedClusterList            = sync.Map{}
-	managedClusterListMutex       = &sync.RWMutex{}
 	installMetricsWithoutAddon    = false
 )