diff --git a/qiskit_experiments/library/characterization/t1.py b/qiskit_experiments/library/characterization/t1.py
index 93dc72395f..6f3c02cfc1 100644
--- a/qiskit_experiments/library/characterization/t1.py
+++ b/qiskit_experiments/library/characterization/t1.py
@@ -48,7 +48,7 @@ class T1(BaseExperiment):
 
         .. jupyter-execute::
 
-            import numpy as np  
+            import numpy as np
             from qiskit_experiments.library import T1
 
             delays = np.arange(1.e-6, 300.e-6, 30.e-6)