diff --git a/README.md b/README.md
index 85926d0..720a636 100644
--- a/README.md
+++ b/README.md
@@ -10,10 +10,10 @@ If you're looking for the same kind of tool, but for APT repositories, I can rec
 
 1. You have python installed (2.6+).
 
-1. You have your S3 credentials available in the `AWS_ACCESS_KEY` and `AWS_SECRET_KEY` environment variables:
+1. You have your S3 credentials available in the `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY` environment variables:
 
-        export AWS_ACCESS_KEY="key"
-        export AWS_SECRET_KEY="secret"
+        export AWS_ACCESS_KEY_ID="key"
+        export AWS_SECRET_ACCESS_KEY="secret"
 
 ## Installation
 
@@ -31,7 +31,7 @@ Use the provided `/test/test.sh` script:
 
     vagrant up
     vagrant ssh
-    AWS_ACCESS_KEY=xx AWS_SECRET_KET=yy BUCKET=zz ./test/test.sh
+    AWS_ACCESS_KEY_ID=xx AWS_SECRET_ACCESS_KEY=yy BUCKET=zz ./test/test.sh
 
 Also:
 
@@ -58,7 +58,7 @@ Have a `~/.rpmmacros` file ready with the following content:
 
 Pass the `--sign` option to `rpm-s3`:
 
-    AWS_ACCESS_KEY="key" AWS_SECRET_KEY="secret" ./bin/rpm-s3 --sign my-app-1.0.0.x86_64.rpm
+    AWS_ACCESS_KEY_ID="key" AWS_SECRET_ACCESS_KEY="secret" ./bin/rpm-s3 --sign my-app-1.0.0.x86_64.rpm
 
 ### Import gpg key to install signed packages
 
diff --git a/bin/rpm-s3 b/bin/rpm-s3
index 54b88a8..5f12ff2 100755
--- a/bin/rpm-s3
+++ b/bin/rpm-s3
@@ -1,18 +1,19 @@
 #!/usr/bin/env python
 """CLI for serialising metadata updates on an s3-hosted yum repository.
 """
+import boto
+import boto.s3.connection
+import collections
+import logging
+import optparse
 import os
+import shutil
+import subprocess
 import sys
+import tempfile
 import time
 import urlparse
-import tempfile
-import shutil
-import optparse
-import logging
-import collections
 import yum
-import boto
-import subprocess
 
 lib_root = os.path.dirname(os.path.dirname(__file__))
 
@@ -107,15 +108,17 @@ class FileGrabber(object):
 
 
 def getclient(base, host_url):
-    if os.getenv('AWS_ACCESS_KEY'):
+    if os.getenv('AWS_ACCESS_KEY_ID'):
         return boto.connect_s3(
-            os.getenv('AWS_ACCESS_KEY'),
-            os.getenv('AWS_SECRET_KEY'),
-            host=host_url
+            os.getenv('AWS_ACCESS_KEY_ID'),
+            os.getenv('AWS_SECRET_ACCESS_KEY'),
+            host=host_url,
+            calling_format=boto.s3.connection.OrdinaryCallingFormat()
         ).get_bucket(base.netloc)
     else:
         return boto.connect_s3(
-            host=host_url
+            host=host_url,
+            calling_format=boto.s3.connection.OrdinaryCallingFormat()
         ).get_bucket(base.netloc)