diff --git a/src/qibocal/protocols/qua/rb_ondevice.py b/src/qibocal/protocols/qua/rb_ondevice.py
index 414dc50e3..6392143b8 100644
--- a/src/qibocal/protocols/qua/rb_ondevice.py
+++ b/src/qibocal/protocols/qua/rb_ondevice.py
@@ -1,4 +1,3 @@
-import json
 import time
 from dataclasses import dataclass, field
 from typing import Optional