diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 99e5458..4e2c6df 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -1067,7 +1067,7 @@
 struct dentry *usb_debug_root;
 EXPORT_SYMBOL_GPL(usb_debug_root);
 
-struct dentry *usb_debug_devices;
+static struct dentry *usb_debug_devices;
 
 static int usb_debugfs_init(void)
 {