diff --git a/gio/gmemoryinputstream.c b/gio/gmemoryinputstream.c
index 37846b6ac..a9e855cef 100644
--- a/gio/gmemoryinputstream.c
+++ b/gio/gmemoryinputstream.c
@@ -476,7 +476,7 @@ g_memory_input_stream_seek (GSeekable     *seekable,
       return FALSE;
     }
 
-  if (absolute < 0 || absolute > priv->len)
+  if (absolute < 0 || (gsize) absolute > priv->len)
     {
       g_set_error_literal (error,
                            G_IO_ERROR,