diff --git a/user-doc/tutorials/trieste-3/do_block_histo.py b/user-doc/tutorials/trieste-3/do_block_histo.py
index c17607e88b81619da208055fac2802f9fa7da10f..15da93bb99ce823f07114d6c15170f7f924cdcef 100755
--- a/user-doc/tutorials/trieste-3/do_block_histo.py
+++ b/user-doc/tutorials/trieste-3/do_block_histo.py
@@ -1,4 +1,3 @@
-import math
 import glob
 import numpy as np
 # Here are some numbers you will need to change if you run this script on grids generated in different contexts