diff --git a/services/ims/input_event_hub.cpp b/services/ims/input_event_hub.cpp
index 9e973dda0bbc760772c0e055bd59bc3e921e6d53..e3daed53c343c988074b02411851b4ae53bb7dcd 100755
--- a/services/ims/input_event_hub.cpp
+++ b/services/ims/input_event_hub.cpp
@@ -17,9 +17,11 @@
 #include "graphic_log.h"
 
 namespace OHOS {
+namespace {
 const uint32_t TOUCH_DEV_ID = 1;
 const uint32_t MOUSE_DEV_ID = 2;
 const uint32_t UNKNOW_DEV_ID = 32;
+}
 IInputInterface* InputEventHub::inputInterface_ = nullptr;
 InputReportEventCb InputEventHub::callback_ = { 0 };
 InputEventHub::ReadCallback InputEventHub::readCallback_ = nullptr;