diff --git a/pkg/volume/flexvolume/probe.go b/pkg/volume/flexvolume/probe.go
index 65b53fb4e7a..4b0eca2e0d7 100644
--- a/pkg/volume/flexvolume/probe.go
+++ b/pkg/volume/flexvolume/probe.go
@@ -33,7 +33,7 @@ import (
 )
 
 type flexVolumeProber struct {
-	mutex          sync.RWMutex
+	mutex          sync.Mutex
 	pluginDir      string         // Flexvolume driver directory
 	runner         exec.Interface // Interface to use for execing flex calls
 	watcher        utilfs.FSWatcher