diff --git a/tnbs/BTC_04_PH/my_benchmark_execution.py b/tnbs/BTC_04_PH/my_benchmark_execution.py
index 3f39a47..c0c5ade 100644
--- a/tnbs/BTC_04_PH/my_benchmark_execution.py
+++ b/tnbs/BTC_04_PH/my_benchmark_execution.py
@@ -171,7 +171,7 @@ def compute_samples(**kwargs):
         min_meas = 5
     max_meas = kwargs.get("max_meas", None)
     samples_.clip(upper=max_meas, lower=min_meas, inplace=True)
-    samples_ = samples_.[0].astype(int)
+    samples_ = samples_[0].astype(int)
     return samples_
 
 def summarize_results(**kwargs):