diff --git a/libvips/foreign/pngload.c b/libvips/foreign/pngload.c
index f2bb9328..7d10605d 100644
--- a/libvips/foreign/pngload.c
+++ b/libvips/foreign/pngload.c
@@ -222,6 +222,7 @@ vips_foreign_load_png_buffer_class_init( VipsForeignLoadPngBufferClass *class )
 	object_class->description = _( "load png from buffer" );
 
 	load_class->is_a_buffer = vips__png_ispng_buffer;
+	load_class->get_flags = vips_foreign_load_png_buffer_get_flags;
 	load_class->header = vips_foreign_load_png_buffer_header;
 	load_class->load = vips_foreign_load_png_buffer_load;
 
diff --git a/libvips/foreign/tiffload.c b/libvips/foreign/tiffload.c
index 7e5fb9c2..d4152b6f 100644
--- a/libvips/foreign/tiffload.c
+++ b/libvips/foreign/tiffload.c
@@ -306,7 +306,7 @@ vips_foreign_load_tiff_buffer_class_init(
 	object_class->description = _( "load tiff from buffer" );
 
 	load_class->is_a_buffer = vips__istiff_buffer;
-	load_class->get_flags = vips_foreign_load_tiff_file_get_flags;
+	load_class->get_flags = vips_foreign_load_tiff_buffer_get_flags;
 	load_class->header = vips_foreign_load_tiff_buffer_header;
 	load_class->load = vips_foreign_load_tiff_buffer_load;