diff --git a/tests/legacy/fake_servers/snapd.py b/tests/legacy/fake_servers/snapd.py
index 4616b28a32..be5c52a01f 100644
--- a/tests/legacy/fake_servers/snapd.py
+++ b/tests/legacy/fake_servers/snapd.py
@@ -53,7 +53,6 @@ def _handle_snaps(self):
 
     def _handle_snap_file(self, parsed_url):
         self.send_response(200)
-        self.send_header("Content-Length", len(parsed_url))
         self.send_header("Content-type", "text/plain")
         self.end_headers()
         self.wfile.write(parsed_url.encode())