diff --git a/libvips/foreign/csvsave.c b/libvips/foreign/csvsave.c
index 4bb88fe9..d7d00660 100644
--- a/libvips/foreign/csvsave.c
+++ b/libvips/foreign/csvsave.c
@@ -303,6 +303,7 @@ vips_foreign_save_csv_target_class_init( VipsForeignSaveCsvTargetClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *object_class = (VipsObjectClass *) class;
+	VipsForeignClass *foreign_class = (VipsForeignClass *) class;
 
 	gobject_class->set_property = vips_object_set_property;
 	gobject_class->get_property = vips_object_get_property;
@@ -310,6 +311,8 @@ vips_foreign_save_csv_target_class_init( VipsForeignSaveCsvTargetClass *class )
 	object_class->nickname = "csvsave_target";
 	object_class->build = vips_foreign_save_csv_target_build;
 
+	foreign_class->suffs = vips_foreign_save_csv_file_suffs;
+
 	VIPS_ARG_OBJECT( class, "target", 1,
 		_( "Target" ),
 		_( "Target to save to" ),