diff --git a/erl_terms/erl_terms_core.py b/erl_terms/erl_terms_core.py
index 4824973..2a42e9d 100644
--- a/erl_terms/erl_terms_core.py
+++ b/erl_terms/erl_terms_core.py
@@ -1,6 +1,7 @@
 import re
 from parsimonious.grammar import Grammar
 import parsimonious.exceptions
+from functools import reduce
 
 class ParseError(Exception):
     pass