diff --git a/win/_base.sh b/win/_base.sh
index ebc652918..62d215718 100644
--- a/win/_base.sh
+++ b/win/_base.sh
@@ -97,6 +97,7 @@ keyring
 python-gnupg
 python-axolotl
 qrcode
+cssutils
 "
 
     build_pip install $(echo "$PIP_REQUIREMENTS" | tr ["\\n"] [" "])
diff --git a/win/dev_env.sh b/win/dev_env.sh
index 4d7869f69..66a1f00b7 100644
--- a/win/dev_env.sh
+++ b/win/dev_env.sh
@@ -30,6 +30,7 @@ docutils
 qrcode
 keyring
 pillow==4.3.0
+cssutils
 "
 
     pip3 install --no-binary ":all:" \