diff --git a/doc/reference/using-cpp.xml b/doc/reference/using-cpp.xml
index 9ae56b2f..395ac588 100644
--- a/doc/reference/using-cpp.xml
+++ b/doc/reference/using-cpp.xml
@@ -41,7 +41,7 @@ main( int argc, char **argv )
   GOptionGroup *main_group;
   GError *error = NULL;
 
-  if( vips_init( argv[0] ) )
+  if( VIPS_INIT( argv[0] ) )
     vips_error_exit( NULL ); 
 
   context = g_option_context_new( "" );