diff --git a/oml/item/handlers.py b/oml/item/handlers.py
index b151554..aabeff2 100644
--- a/oml/item/handlers.py
+++ b/oml/item/handlers.py
@@ -66,7 +66,7 @@ def serve_static(handler, path, mimetype, include_body=True, disposition=None):
             handler.set_status(206)
             r = handler.request.headers.get('Range').split('=')[-1].split('-')
             start = int(r[0])
-            end = int(r[1]) if r[1] else size
+            end = int(r[1]) if r[1] else (size - 1)
             length = end - start + 1
             handler.set_header('Content-Length', str(length))
             handler.set_header('Content-Range', 'bytes %s-%s/%s' % (start, end, size))