diff --git a/tools/machinetag.py b/tools/machinetag.py
index d26252f..66ed96c 100755
--- a/tools/machinetag.py
+++ b/tools/machinetag.py
@@ -32,7 +32,7 @@ import argparse
 import os
 import sys
 
-skip_list = ['death-possibilities', 'poison-taxonomy']
+skip_list = ['death-possibilities', 'poison-taxonomy', 'doping-substances']
 taxonomies = []
 
 # Get our current directory from file location