diff --git a/pkg/mining/container.go b/pkg/mining/container.go
index 21ff380..fdde0f6 100644
--- a/pkg/mining/container.go
+++ b/pkg/mining/container.go
@@ -118,8 +118,8 @@ func (c *Container) Initialize(ctx context.Context) error {
 	c.eventHub = NewEventHub()
 
 	// Wire up event hub to manager
-	if mgr, ok := c.manager.(*Manager); ok {
-		mgr.SetEventHub(c.eventHub)
+	if concreteManager, ok := c.manager.(*Manager); ok {
+		concreteManager.SetEventHub(c.eventHub)
 	}
 
 	c.initialized = true
@@ -184,8 +184,8 @@ func (c *Container) Shutdown(ctx context.Context) error {
 	}
 
 	// 4. Stop miner manager
-	if mgr, ok := c.manager.(*Manager); ok {
-		mgr.Stop()
+	if concreteManager, ok := c.manager.(*Manager); ok {
+		concreteManager.Stop()
 	}
 
 	// 5. Close database
diff --git a/pkg/mining/service.go b/pkg/mining/service.go
index 747ab26..7389d47 100644
--- a/pkg/mining/service.go
+++ b/pkg/mining/service.go
@@ -428,8 +428,8 @@ func NewService(manager ManagerInterface, listenAddr string, displayAddr string,
 	go eventHub.Run()
 
 	// Wire up event hub to manager for miner events
-	if mgr, ok := manager.(*Manager); ok {
-		mgr.SetEventHub(eventHub)
+	if concreteManager, ok := manager.(*Manager); ok {
+		concreteManager.SetEventHub(eventHub)
 	}
 
 	// Set up state provider for WebSocket state sync on reconnect