diff --git a/src/gio/memory_input_stream/error.rs b/src/gio/memory_input_stream/error.rs
index 093d2a2..b5cda40 100644
--- a/src/gio/memory_input_stream/error.rs
+++ b/src/gio/memory_input_stream/error.rs
@@ -1,3 +1,4 @@
+#[derive(Debug)]
 pub enum Error {
     BytesTotal,
     InputStream,