diff --git a/testing/docker/alpine3.8/Dockerfile b/testing/docker/alpine3.8/Dockerfile
index bfef1bd4..43da7acd 100644
--- a/testing/docker/alpine3.8/Dockerfile
+++ b/testing/docker/alpine3.8/Dockerfile
@@ -1,6 +1,6 @@
 FROM alpine:3.8
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN addgroup -g $CTNG_GID ctng
 RUN adduser -D -h /home/ctng -G ctng -u $CTNG_UID -s /bin/bash ctng
 # Activate community and testing repositories
diff --git a/testing/docker/archlinux/Dockerfile b/testing/docker/archlinux/Dockerfile
index 2298abd8..1a6a1486 100644
--- a/testing/docker/archlinux/Dockerfile
+++ b/testing/docker/archlinux/Dockerfile
@@ -1,6 +1,6 @@
 FROM archlinux/base:latest
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN pacman -Sy --noconfirm archlinux-keyring
 RUN pacman -Syu --noconfirm
 RUN pacman -S --noconfirm base-devel git help2man python unzip wget audit
diff --git a/testing/docker/centos6/Dockerfile b/testing/docker/centos6/Dockerfile
index 6c224cd4..7f11fe1a 100644
--- a/testing/docker/centos6/Dockerfile
+++ b/testing/docker/centos6/Dockerfile
@@ -1,6 +1,6 @@
 FROM centos:6
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN groupadd -g $CTNG_GID ctng
 RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
 RUN yum install -y epel-release
diff --git a/testing/docker/centos7/Dockerfile b/testing/docker/centos7/Dockerfile
index 0631c19e..e7b812a2 100644
--- a/testing/docker/centos7/Dockerfile
+++ b/testing/docker/centos7/Dockerfile
@@ -1,6 +1,6 @@
 FROM centos:7
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN groupadd -g $CTNG_GID ctng
 RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
 RUN yum install -y epel-release
diff --git a/testing/docker/fedora29/Dockerfile b/testing/docker/fedora29/Dockerfile
index 65a0c60e..15dfb348 100644
--- a/testing/docker/fedora29/Dockerfile
+++ b/testing/docker/fedora29/Dockerfile
@@ -1,6 +1,6 @@
 FROM fedora:29
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN groupadd -g $CTNG_GID ctng
 RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
 RUN yum install -y autoconf gperf bison file flex texinfo help2man gcc-c++ libtool make patch \
diff --git a/testing/docker/gentoo-amd64/Dockerfile b/testing/docker/gentoo-amd64/Dockerfile
index ec5c1312..b261cc38 100644
--- a/testing/docker/gentoo-amd64/Dockerfile
+++ b/testing/docker/gentoo-amd64/Dockerfile
@@ -1,6 +1,6 @@
 FROM gentoo/stage3-amd64-hardened
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN groupadd -g $CTNG_GID ctng
 RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
 RUN wget -O /sbin/dumb-init https://github.com/Yelp/dumb-init/releases/download/v1.2.1/dumb-init_1.2.1_amd64
diff --git a/testing/docker/mint19-amd64/Dockerfile b/testing/docker/mint19-amd64/Dockerfile
index 2b4f1aef..cfc05e37 100644
--- a/testing/docker/mint19-amd64/Dockerfile
+++ b/testing/docker/mint19-amd64/Dockerfile
@@ -1,6 +1,6 @@
 FROM linuxmintd/mint19-amd64
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN groupadd -g $CTNG_GID ctng
 RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
 RUN apt-get update
diff --git a/testing/docker/ubuntu16.04/Dockerfile b/testing/docker/ubuntu16.04/Dockerfile
index e2ea06dc..a0b68ae1 100644
--- a/testing/docker/ubuntu16.04/Dockerfile
+++ b/testing/docker/ubuntu16.04/Dockerfile
@@ -1,6 +1,6 @@
 FROM ubuntu:16.04
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN groupadd -g $CTNG_GID ctng
 RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
 RUN apt-get update
diff --git a/testing/docker/ubuntu18.04/Dockerfile b/testing/docker/ubuntu18.04/Dockerfile
index 5dab8422..918dd930 100644
--- a/testing/docker/ubuntu18.04/Dockerfile
+++ b/testing/docker/ubuntu18.04/Dockerfile
@@ -1,6 +1,6 @@
 FROM ubuntu:18.04
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN groupadd -g $CTNG_GID ctng
 RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
 RUN apt-get update
diff --git a/testing/docker/ubuntu19.10/Dockerfile b/testing/docker/ubuntu19.10/Dockerfile
index 453d97c7..0c39ffcd 100644
--- a/testing/docker/ubuntu19.10/Dockerfile
+++ b/testing/docker/ubuntu19.10/Dockerfile
@@ -1,6 +1,6 @@
 FROM ubuntu:19.10
-ARG CTNG_UID
-ARG CTNG_GID
+ARG CTNG_UID=1000
+ARG CTNG_GID=1000
 RUN groupadd -g $CTNG_GID ctng
 RUN useradd -d /home/ctng -m -g $CTNG_GID -u $CTNG_UID -s /bin/bash ctng
 RUN apt-get update