diff --git a/TODO b/TODO
index e8b793ce..0f94d31e 100644
--- a/TODO
+++ b/TODO
@@ -1,7 +1,3 @@
-- had an assert fail in im_render() invalidate callback, argh
-
-  can we make this safer?
-
 - doing im_create_fmask() and friends
 
 - how about im_invalidate_area()? we currently repaint the whole window on
diff --git a/libvips/iofuncs/im_prepare.c b/libvips/iofuncs/im_prepare.c
index 9379dcd9..d64fc776 100644
--- a/libvips/iofuncs/im_prepare.c
+++ b/libvips/iofuncs/im_prepare.c
@@ -502,5 +502,4 @@ im_invalidate( IMAGE *im )
 	im_invalidate_trigger( to_be_invalidated );
 
 	g_slist_free( to_be_invalidated );
-
 }