diff --git a/daemon/cluster/controllers/plugin/controller.go b/daemon/cluster/controllers/plugin/controller.go
index 1f4a80aaa5..bad3d7243e 100644
--- a/daemon/cluster/controllers/plugin/controller.go
+++ b/daemon/cluster/controllers/plugin/controller.go
@@ -34,7 +34,6 @@ type Controller struct {
 
 	pluginID  string
 	serviceID string
-	taskID    string
 
 	// hook used to signal tests that `Wait()` is actually ready and waiting
 	signalWaitReady func()