diff --git a/Dockerfile.cron b/Dockerfile.cron
index 6371a76..2713a36 100644
--- a/Dockerfile.cron
+++ b/Dockerfile.cron
@@ -28,7 +28,8 @@ COPY utils/build/import-seafile-apt-key.sh /
 COPY assets/docker-entrypoint.sh /entrypoint.sh
 
 # Safely import Seafile APT key, then install both seafile-cli and supervisord.
-RUN echo "deb http://deb.seadrive.org jessie main" \
+RUN mkdir -p /etc/apt/source.list.d/ ;\
+    echo "deb http://deb.seadrive.org jessie main" \
         > /etc/apt/source.list.d/seafile.list ;\
     bash /import-seafile-apt-key.sh ;\
     apt-get update ;\
diff --git a/Dockerfile.supervisord b/Dockerfile.supervisord
index 0075026..c13b15c 100644
--- a/Dockerfile.supervisord
+++ b/Dockerfile.supervisord
@@ -28,7 +28,8 @@ COPY utils/build/import-seafile-apt-key.sh /
 COPY assets/docker-entrypoint.sh /entrypoint.sh
 
 # Safely import Seafile APT key, then install both seafile-cli and supervisord.
-RUN echo "deb http://deb.seadrive.org jessie main" \
+RUN mkdir -p /etc/apt/source.list.d/ ;\
+    echo "deb http://deb.seadrive.org jessie main" \
         > /etc/apt/source.list.d/seafile.list ;\
     /bin/bash /import-seafile-apt-key.sh ;\
     apt-get update ;\