diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 1b54bb57a9fb..cb30a524d16d 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -3308,7 +3308,7 @@ err_invalid_target_handle:
  *
  * Cleanup buffer and free it.
  */
-void
+static void
 binder_free_buf(struct binder_proc *proc, struct binder_buffer *buffer)
 {
 	if (buffer->transaction) {