diff --git a/fs/char_dev.c b/fs/char_dev.c
index a745b1d..c1e3537 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -328,7 +328,7 @@
 	spin_unlock(&cdev_lock);
 }
 
-void cdev_purge(struct cdev *cdev)
+static void cdev_purge(struct cdev *cdev)
 {
 	spin_lock(&cdev_lock);
 	while (!list_empty(&cdev->list)) {