diff --git a/bindings/pyroot_experimental/PyROOT/python/ROOT/pythonization/_generic.py b/bindings/pyroot_experimental/PyROOT/python/ROOT/pythonization/_generic.py
index 051edb6c7f39fda73241c3b21acbb81103eaf1fe..a918ee09be25de6a5c826cd2887d0c6af00d2921 100644
--- a/bindings/pyroot_experimental/PyROOT/python/ROOT/pythonization/_generic.py
+++ b/bindings/pyroot_experimental/PyROOT/python/ROOT/pythonization/_generic.py
@@ -12,7 +12,7 @@ from libROOTPython import AddPrettyPrintingPyz
 from ROOT import pythonization
 
 def add_len(klass, getter_name):
-	# Parameters:
+    # Parameters:
     # klass: class to be pythonized
     # getter_name: name of the method to be associated with `len` in `klass`