diff --git a/mastodon/Dockerfile.master b/mastodon/Dockerfile.master
index 994afea..2b680a3 100644
--- a/mastodon/Dockerfile.master
+++ b/mastodon/Dockerfile.master
@@ -43,6 +43,7 @@ RUN apk -U upgrade \
     icu-dev \
     libffi-dev \
     libidn-dev \
+    libtool \
     postgresql-dev \
     protobuf-dev \
     python \