diff --git a/libvips/iofuncs/sink.c b/libvips/iofuncs/sink.c
index 90517c2f..6d4c26d1 100644
--- a/libvips/iofuncs/sink.c
+++ b/libvips/iofuncs/sink.c
@@ -31,8 +31,8 @@
  */
 
 /*
- */
 #define VIPS_DEBUG
+ */
 
 #ifdef HAVE_CONFIG_H
 #include <config.h>