diff --git a/coretex/coretex/experiment/experiment.py b/coretex/coretex/experiment/experiment.py
index 81462e2c..250669d6 100644
--- a/coretex/coretex/experiment/experiment.py
+++ b/coretex/coretex/experiment/experiment.py
@@ -468,4 +468,4 @@ def run(
         if response.hasFailed():
             raise NetworkRequestError(response, "Failed to create experiment")
 
-        return cls.fetchById(response.json[0])
+        return cls.fetchById(response.json["experiment_ids"][0])