diff --git a/parsedmarc/Dockerfile b/parsedmarc/Dockerfile
index cca9af5..8af2123 100644
--- a/parsedmarc/Dockerfile
+++ b/parsedmarc/Dockerfile
@@ -1,6 +1,6 @@
 FROM python:alpine
 
-RUN apk add build-base libxml2-dev libxslt-dev \
+RUN apk add build-base libffi-dev libxml2-dev libxslt-dev \
     && pip install parsedmarc
 
 COPY parsedmarc.ini /