diff --git a/onmt/transforms/filtering.py b/onmt/transforms/filtering.py
index 994fcf1d..1468bf22 100644
--- a/onmt/transforms/filtering.py
+++ b/onmt/transforms/filtering.py
@@ -1,6 +1,6 @@
 from onmt.transforms import register_transform
 from .transform import Transform, ObservableStats
-import regex as re
+import re
 import math
 import itertools
 import string