diff --git a/ngrams/term_frequencies.py b/ngrams/term_frequencies.py
index 741e914..1bb0f70 100755
--- a/ngrams/term_frequencies.py
+++ b/ngrams/term_frequencies.py
@@ -14,6 +14,7 @@ from nltk.util import ngrams
 import string
 from random import random
 from pathlib import Path
+os.environ(["_JAVA_OPTIONS"]="-Xmx920g"
 
 # remove urls
 # taken from https://stackoverflow.com/questions/3809401/what-is-a-good-regular-expression-to-match-a-url