diff --git a/Dockerfile b/Dockerfile
index 02559cc..6b3ba2b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM alpine:3.12.1
 
 RUN apk add --no-cache \
-      openresolv iptables iproute2 wireguard-tools \
+      openresolv iptables ip6tables iproute2 wireguard-tools \
       findutils # Needed for find's -printf flag.
 
 COPY entrypoint.sh /entrypoint.sh