diff --git a/TODO b/TODO
index 383637be..725b1add 100644
--- a/TODO
+++ b/TODO
@@ -1,4 +1,4 @@
-
+- maybe IM_INTERPOLATE() isn't a good idea? maybe just IM_GOBJECT?
 
 
 - try making vips_add(), an operator as a class
diff --git a/libsrc/iofuncs/object.c b/libsrc/iofuncs/object.c
index f40a9cab..fe40e5d8 100644
--- a/libsrc/iofuncs/object.c
+++ b/libsrc/iofuncs/object.c
@@ -30,8 +30,8 @@
  */
 
 /*
- */
 #define DEBUG
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>
@@ -1015,7 +1015,6 @@ vips_object_to_string_optional( VipsObject *object,
 void
 vips_object_to_string( VipsObject *object, VipsBuf *buf )
 {
-	VipsObjectClass *object_class = VIPS_OBJECT_GET_CLASS( object );
 	gboolean first;
 
 	/* Nicknames are not guaranteed to be unique, so use the full type