diff --git a/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootMaintenanceManagerCustomizedUiSupport.c b/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootMaintenanceManagerCustomizedUiSupport.c
index 177b2498d3..fefb714b91 100644
--- a/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootMaintenanceManagerCustomizedUiSupport.c
+++ b/MdeModulePkg/Library/BootMaintenanceManagerUiLib/BootMaintenanceManagerCustomizedUiSupport.c
@@ -26,7 +26,7 @@ typedef struct {
   BOOLEAN         EmptyLineAfter;
 } UI_HII_DRIVER_INSTANCE;
 
-UI_HII_DRIVER_INSTANCE       *gHiiDriverList;
+STATIC UI_HII_DRIVER_INSTANCE       *gHiiDriverList;
 
 
 /**