diff --git a/pkg/kubelet/cm/deviceplugin/device_plugin_handler.go b/pkg/kubelet/cm/deviceplugin/device_plugin_handler.go
index 23d67c3fd6d..38248733c9a 100644
--- a/pkg/kubelet/cm/deviceplugin/device_plugin_handler.go
+++ b/pkg/kubelet/cm/deviceplugin/device_plugin_handler.go
@@ -77,6 +77,10 @@ func NewHandlerImpl(updateCapacityFunc func(v1.ResourceList)) (*HandlerImpl, err
 	deviceManagerMonitorCallback := func(resourceName string, added, updated, deleted []pluginapi.Device) {
 		var capacity = v1.ResourceList{}
 		kept := append(updated, added...)
+
+		handler.Lock()
+		defer handler.Unlock()
+
 		if _, ok := handler.allDevices[resourceName]; !ok {
 			handler.allDevices[resourceName] = sets.NewString()
 		}