diff --git a/libvips/include/vips/internal.h b/libvips/include/vips/internal.h
index aef1573c..2ac14806 100644
--- a/libvips/include/vips/internal.h
+++ b/libvips/include/vips/internal.h
@@ -209,7 +209,6 @@ int im__balance( VipsImage *ref, VipsImage *sec, VipsImage *out,
 
 void imb_Lab2LCh( float *, float *, int );
 void imb_LCh2Lab( float *, float *, int );
-void imb_XYZ2Lab_tables( void );
 
 /* A colour temperature.
  */