diff --git a/tests/dockerfiles/Dockerfile.debian-jessie b/tests/dockerfiles/Dockerfile.debian-jessie
index b63e28f..edafeac 100644
--- a/tests/dockerfiles/Dockerfile.debian-jessie
+++ b/tests/dockerfiles/Dockerfile.debian-jessie
@@ -8,7 +8,7 @@ RUN apt-get update -y && apt-get install -y --no-install-recommends \
     python-dev \
     python-pip \
     git \
-    apt-transport-https
+    apt-transport-https \
  && rm -rf /var/lib/apt/lists/*
 
 RUN pip install --upgrade setuptools && pip install ansible
diff --git a/tests/dockerfiles/Dockerfile.debian-stretch b/tests/dockerfiles/Dockerfile.debian-stretch
index 8481241..5cb8157 100644
--- a/tests/dockerfiles/Dockerfile.debian-stretch
+++ b/tests/dockerfiles/Dockerfile.debian-stretch
@@ -9,7 +9,7 @@ RUN apt-get update -y && apt-get install -y --no-install-recommends \
     python-pip \
     git \
     systemd \
-    apt-transport-https
+    apt-transport-https \
  && rm -rf /var/lib/apt/lists/*
 
 RUN pip install --upgrade setuptools && pip install ansible
diff --git a/tests/dockerfiles/Dockerfile.ubuntu-trusty b/tests/dockerfiles/Dockerfile.ubuntu-trusty
index 3d3466a..4223f20 100644
--- a/tests/dockerfiles/Dockerfile.ubuntu-trusty
+++ b/tests/dockerfiles/Dockerfile.ubuntu-trusty
@@ -5,7 +5,7 @@ RUN apt-get update && apt-get dist-upgrade -y && apt-get install -y software-pro
 RUN apt-add-repository -y ppa:ansible/ansible && apt-get update && apt-get install -y \
     git \
     ansible \
-    apt-transport-https
+    apt-transport-https \
  && rm -rf /var/lib/apt/lists/*
 
 RUN echo "[local]\nlocalhost ansible_connection=local" > /etc/ansible/hosts
diff --git a/tests/dockerfiles/Dockerfile.ubuntu-xenial b/tests/dockerfiles/Dockerfile.ubuntu-xenial
index d5457d3..56b7c39 100644
--- a/tests/dockerfiles/Dockerfile.ubuntu-xenial
+++ b/tests/dockerfiles/Dockerfile.ubuntu-xenial
@@ -5,7 +5,7 @@ RUN apt-get update && apt-get dist-upgrade -y && apt-get install -y software-pro
 RUN apt-add-repository -y ppa:ansible/ansible && apt-get update && apt-get install -y \
     git \
     ansible \
-    apt-transport-https
+    apt-transport-https \
  && rm -rf /var/lib/apt/lists/*
 
 RUN echo "[local]\nlocalhost ansible_connection=local" > /etc/ansible/hosts