diff --git a/centos/Dockerfile b/centos/Dockerfile
index e656e71..43d3281 100644
--- a/centos/Dockerfile
+++ b/centos/Dockerfile
@@ -1,4 +1,5 @@
-FROM centos:7
+ARG FROM=centos:7
+FROM ${FROM}
 
 ENV PATH=/var/lib/openstack/bin:$PATH
 ENV PROJECT=glance
diff --git a/centos/ceph/Dockerfile b/centos/ceph/Dockerfile
index f23719f..580c78f 100644
--- a/centos/ceph/Dockerfile
+++ b/centos/ceph/Dockerfile
@@ -1,4 +1,5 @@
-FROM openstackloci/glance:centos
+ARG FROM=openstackloci/glance:centos
+FROM ${FROM}
 
 ARG OVERRIDE=override
 
diff --git a/debian/Dockerfile b/debian/Dockerfile
index 4865094..d5fc4fe 100644
--- a/debian/Dockerfile
+++ b/debian/Dockerfile
@@ -1,4 +1,5 @@
-FROM debian:jessie-slim
+ARG FROM=debian:jessie-slim
+FROM ${FROM}
 
 ENV PATH=/var/lib/openstack/bin:$PATH
 ENV PROJECT=glance
diff --git a/debian/ceph/Dockerfile b/debian/ceph/Dockerfile
index ea0e7b6..64530c9 100644
--- a/debian/ceph/Dockerfile
+++ b/debian/ceph/Dockerfile
@@ -1,4 +1,5 @@
-FROM openstackloci/glance:debian
+ARG FROM=openstackloci/glance:debian
+FROM ${FROM}
 
 ARG OVERRIDE=override
 
diff --git a/ubuntu/Dockerfile b/ubuntu/Dockerfile
index 2f15c69..62371a0 100644
--- a/ubuntu/Dockerfile
+++ b/ubuntu/Dockerfile
@@ -1,4 +1,5 @@
-FROM ubuntu:xenial
+ARG FROM=ubuntu:xenial
+FROM ${FROM}
 
 ENV PATH=/var/lib/openstack/bin:$PATH
 ENV PROJECT=glance
diff --git a/ubuntu/ceph/Dockerfile b/ubuntu/ceph/Dockerfile
index 0ac766d..014f84b 100644
--- a/ubuntu/ceph/Dockerfile
+++ b/ubuntu/ceph/Dockerfile
@@ -1,4 +1,5 @@
-FROM openstackloci/glance:ubuntu
+ARG FROM=openstackloci/glance:ubuntu
+FROM ${FROM}
 
 ARG OVERRIDE=override