diff --git a/letsencrypt-auto-source/Dockerfile.precise b/letsencrypt-auto-source/Dockerfile.precise
index c8b593774..5ee32c7cc 100644
--- a/letsencrypt-auto-source/Dockerfile.precise
+++ b/letsencrypt-auto-source/Dockerfile.precise
@@ -10,6 +10,8 @@ RUN useradd --create-home --home-dir /home/lea --shell /bin/bash --groups sudo -
 RUN apt-get update && \
     apt-get -q -y install python-pip sudo openssl && \
     apt-get clean
+
+ENV PIP_INDEX_URL https://pypi.python.org/simple
 RUN pip install nose
 
 # Let that user sudo:
diff --git a/letsencrypt-auto-source/Dockerfile.wheezy b/letsencrypt-auto-source/Dockerfile.wheezy
index f86795e08..acdb791a4 100644
--- a/letsencrypt-auto-source/Dockerfile.wheezy
+++ b/letsencrypt-auto-source/Dockerfile.wheezy
@@ -10,6 +10,8 @@ RUN useradd --create-home --home-dir /home/lea --shell /bin/bash --groups sudo -
 RUN apt-get update && \
     apt-get -q -y install python-pip sudo openssl && \
     apt-get clean
+
+ENV PIP_INDEX_URL https://pypi.python.org/simple
 RUN pip install nose
 
 # Let that user sudo: