diff --git a/requirements.txt b/requirements.txt
index 862cb229..1d505f10 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -12,3 +12,4 @@ tqdm
 soundfile
 phonemizer
 bokeh==1.4.0
+inflect
diff --git a/requirements_tests.txt b/requirements_tests.txt
index 36243398..c3c32fd2 100644
--- a/requirements_tests.txt
+++ b/requirements_tests.txt
@@ -12,6 +12,7 @@ flask
 scipy
 tqdm
 soundfile
+inflect
 phonemizer
 bokeh==1.4.0
 nose
diff --git a/setup.py b/setup.py
index 96032de0..462f0056 100644
--- a/setup.py
+++ b/setup.py
@@ -106,8 +106,8 @@ setup(
         "matplotlib",
         "Pillow",
         "flask",
-        # "lws",
         "tqdm",
+        "inflect",
         "bokeh==1.4.0",
         "soundfile",
         "phonemizer @ https://github.com/bootphon/phonemizer/tarball/master",