diff --git a/quam/serialisation/json.py b/quam/serialisation/json.py
index e2d56655..f78df5e3 100644
--- a/quam/serialisation/json.py
+++ b/quam/serialisation/json.py
@@ -174,7 +174,7 @@ def load(
                     continue
 
                 with open(file, "r") as f:
-                    file_contents = json.load(f)
+                    file_contents = json.load(f, object_hook=convert_int_keys)
                 contents.update(file_contents)
 
                 if file.name == self.default_filename: