diff --git a/keystoneclient/contrib/ec2/utils.py b/keystoneclient/contrib/ec2/utils.py
index 3b722f23c..899b95a05 100644
--- a/keystoneclient/contrib/ec2/utils.py
+++ b/keystoneclient/contrib/ec2/utils.py
@@ -232,12 +232,19 @@ class Ec2Signer(object):
                 header_list.append('%s:%s' % (h, headers_lower[h]))
             return '\n'.join(header_list) + '\n'
 
+        def canonical_query_str(verb, params):
+            # POST requests pass parameters in through the request body
+            canonical_qs = ''
+            if verb.upper() != 'POST':
+                canonical_qs = self._canonical_qs(params)
+            return canonical_qs
+
         # Create canonical request:
         # http://docs.aws.amazon.com/general/latest/gr/
         # sigv4-create-canonical-request.html
         # Get parameters and headers in expected string format
         cr = "\n".join((verb.upper(), path,
-                        self._canonical_qs(params),
+                        canonical_query_str(verb, params),
                         canonical_header_str(),
                         auth_param('SignedHeaders'),
                         body_hash))
diff --git a/keystoneclient/tests/test_ec2utils.py b/keystoneclient/tests/test_ec2utils.py
index ff4aee356..71fc176b5 100644
--- a/keystoneclient/tests/test_ec2utils.py
+++ b/keystoneclient/tests/test_ec2utils.py
@@ -130,7 +130,17 @@ class Ec2SignerTest(testtools.TestCase):
         # examples specify no query string, but the final POST example
         # does, apparently incorrectly since an empty parameter list
         # aligns all steps and the final signature with the examples
-        params = {}
+        params = {'Action': 'CreateUser',
+                  'UserName': 'NewUser',
+                  'Version': '2010-05-08',
+                  'X-Amz-Algorithm': 'AWS4-HMAC-SHA256',
+                  'X-Amz-Credential': 'AKIAEXAMPLE/20140611/'
+                                      'us-east-1/iam/aws4_request',
+                  'X-Amz-Date': '20140611T231318Z',
+                  'X-Amz-Expires': '30',
+                  'X-Amz-SignedHeaders': 'host',
+                  'X-Amz-Signature': 'ced6826de92d2bdeed8f846f0bf508e8'
+                                     '559e98e4b0199114b84c54174deb456c'}
         credentials = {'host': 'iam.amazonaws.com',
                        'verb': 'POST',
                        'path': '/',