diff --git a/examples/linear_model/plot_sparse_logistic_regression_mnist.py b/examples/linear_model/plot_sparse_logistic_regression_mnist.py
index 22e4e9cd48e60..e4a44e989b565 100644
--- a/examples/linear_model/plot_sparse_logistic_regression_mnist.py
+++ b/examples/linear_model/plot_sparse_logistic_regression_mnist.py
@@ -75,7 +75,7 @@
     )
     l1_plot.set_xticks(())
     l1_plot.set_yticks(())
-    l1_plot.set_xlabel("Class %i" % i)
+    l1_plot.set_xlabel(f"Class {i}")
 plt.suptitle("Classification vector for...")
 
 run_time = time.time() - t0