diff --git a/tools/vm/ubuntu1604/30_docker.sh b/tools/vm/ubuntu1604/30_docker.sh
index d393133e4..332a03dfb 100755
--- a/tools/vm/ubuntu1604/30_docker.sh
+++ b/tools/vm/ubuntu1604/30_docker.sh
@@ -54,11 +54,8 @@ while true; do
 done
 
 # Enable experimental features, for cross-building aarch64 images.
-# Enable Docker IPv6.
 cat > /etc/docker/daemon.json <<EOF
 {
-    "experimental": true,
-    "fixed-cidr-v6": "2001:db8:1::/64",
-    "ipv6": true
+    "experimental": true
 }
 EOF