diff --git a/stretch/x86/Dockerfile b/stretch/x86/Dockerfile
index 2f5a79ae3036a2db6bb6f204a34d515674b5ba8a..a2e88c0f31367ff6d0a54f6a9737387a0b3d572b 100644
--- a/stretch/x86/Dockerfile
+++ b/stretch/x86/Dockerfile
@@ -7,7 +7,7 @@ RUN apt-get update \
 
 RUN apt-get install -y \
   sudo wget curl tar expect git \
-  devscripts build-essential lintian ccache pbuilder aptitude apt-utils
+  devscripts build-essential lintian ccache pbuilder aptitude apt-utils apt-transport-https
 
 RUN echo "deb http://deb.debian.org/debian stretch-backports main" >/etc/apt/sources.list.d/backports.list
 
diff --git a/stretch/x86_64/Dockerfile b/stretch/x86_64/Dockerfile
index bfbae387e16b43bafdbcef28ed446bc586acc598..8b26755a04c96002fb84000264b316d2dde0adec 100644
--- a/stretch/x86_64/Dockerfile
+++ b/stretch/x86_64/Dockerfile
@@ -7,7 +7,7 @@ RUN apt-get update \
 
 RUN apt-get install -y \
   sudo wget curl tar expect git \
-  devscripts build-essential lintian ccache pbuilder aptitude apt-utils
+  devscripts build-essential lintian ccache pbuilder aptitude apt-utils apt-transport-https
 
 RUN echo "deb http://deb.debian.org/debian stretch-backports main" >/etc/apt/sources.list.d/backports.list