diff --git a/requirements/edx/base.txt b/requirements/edx/base.txt
index 28525fe740..061193089a 100644
--- a/requirements/edx/base.txt
+++ b/requirements/edx/base.txt
@@ -15,6 +15,7 @@ cssselect==0.9.1
 dealer==2.0.4
 defusedxml==0.4.1
 django-babel-underscore==0.4.2
+markey==0.7  # From django-babel-underscore
 django-celery==3.1.16
 django-config-models==0.1.3
 django-countries==4.0