diff --git a/gdk/gdkdmabuf.c b/gdk/gdkdmabuf.c
index 02eddb1694..f5d7e12928 100644
--- a/gdk/gdkdmabuf.c
+++ b/gdk/gdkdmabuf.c
@@ -2475,7 +2475,7 @@ gdk_dmabuf_is_disjoint (const GdkDmabuf *dmabuf)
     {
       struct stat plane_stat;
 
-      if (fstat (dmabuf->planes[0].fd, &plane_stat) != 0)
+      if (fstat (dmabuf->planes[i].fd, &plane_stat) != 0)
         return TRUE;
 
       if (first_stat.st_ino != plane_stat.st_ino)