diff --git a/Aws/Core.hs b/Aws/Core.hs
--- a/Aws/Core.hs
+++ b/Aws/Core.hs
@@ -130,20 +130,23 @@
 import           System.Directory
 import           System.Environment
 import           System.FilePath          ((</>))
+#if MIN_VERSION_time(1,5,0)
+import           Data.Time.Format
+#else
 import           System.Locale
+#endif
 import qualified Text.XML                 as XML
 import qualified Text.XML.Cursor          as Cu
 import           Text.XML.Cursor          hiding (force, forceM)
 -------------------------------------------------------------------------------
 
-
 -- | Types that can be logged (textually).
 class Loggable a where
     toLogText :: a -> T.Text
 
 -- | A response with metadata. Can also contain an error response, or
 -- an internal error, via 'Attempt'.
--- 
+--
 -- Response forms a Writer-like monad.
 data Response m a = Response { responseMetadata :: m
                              , responseResult :: Either E.SomeException a }
@@ -222,10 +225,10 @@
 
 
 -- | Associates a request type and a response type in a bi-directional way.
--- 
+--
 -- This allows the type-checker to infer the response type when given
 -- the request type and vice versa.
--- 
+--
 -- Note that the actual request generation and response parsing
 -- resides in 'SignQuery' and 'ResponseConsumer' respectively.
 class (SignQuery r, ResponseConsumer r a, Loggable (ResponseMetadata a))
@@ -458,29 +461,33 @@
       , HTTP.host = sqHost
       , HTTP.port = sqPort
       , HTTP.path = sqPath
-      , HTTP.queryString = HTTP.renderQuery False sqQuery
+      , HTTP.queryString =
+          if sqMethod == PostQuery
+            then ""
+            else HTTP.renderQuery False sqQuery
+
       , HTTP.requestHeaders = catMaybes [ checkDate (\d -> ("Date", fmtRfc822Time d)) sqDate
                                         , fmap (\c -> ("Content-Type", c)) contentType
                                         , fmap (\md5 -> ("Content-MD5", Base64.encode $ toBytes md5)) sqContentMd5
                                         , fmap (\auth -> ("Authorization", auth)) mauth]
                               ++ sqAmzHeaders
                               ++ sqOtherHeaders
-      , HTTP.requestBody = 
+      , HTTP.requestBody =
 
         -- An explicityly defined body parameter should overwrite everything else.
         case sqBody of
           Just x -> x
-          Nothing -> 
+          Nothing ->
             -- a POST query should convert its query string into the body
             case sqMethod of
-              PostQuery -> HTTP.RequestBodyLBS . Blaze.toLazyByteString $ 
+              PostQuery -> HTTP.RequestBodyLBS . Blaze.toLazyByteString $
                            HTTP.renderQueryBuilder False sqQuery
               _         -> HTTP.RequestBodyBuilder 0 mempty
 
       , HTTP.decompress = HTTP.alwaysDecompress
       , HTTP.checkStatus = \_ _ _ -> Nothing
       }
-    where 
+    where
       checkDate f mb = maybe (f <$> mb) (const Nothing) $ lookup "date" sqOtherHeaders
       -- An explicitly defined content-type should override everything else.
       contentType = sqContentType `mplus` defContentType
@@ -587,7 +594,7 @@
 -- See <http://docs.aws.amazon.com/general/latest/gr/signature-version-4.html>: you must create the
 -- canonical request as explained by Step 1 and this function takes care of Steps 2 and 3.
 authorizationV4 :: SignatureData
-                -> AuthorizationHash 
+                -> AuthorizationHash
                 -> B.ByteString -- ^ region, e.g. us-east-1
                 -> B.ByteString -- ^ service, e.g. dynamodb
                 -> B.ByteString -- ^ SignedHeaders, e.g. content-type;host;x-amz-date;x-amz-target
@@ -671,7 +678,7 @@
 -- | @queryList f prefix xs@ constructs a query list from a list of
 -- elements @xs@, using a common prefix @prefix@, and a transformer
 -- function @f@.
--- 
+--
 -- A dot (@.@) is interspersed between prefix and generated key.
 --
 -- Example:
diff --git a/Aws/Iam/Core.hs b/Aws/Iam/Core.hs
--- a/Aws/Iam/Core.hs
+++ b/Aws/Iam/Core.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE FlexibleContexts      #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE RecordWildCards       #-}
@@ -32,7 +33,11 @@
 import           Data.Typeable
 import qualified Network.HTTP.Conduit           as HTTP
 import qualified Network.HTTP.Types             as HTTP
+#if MIN_VERSION_time(1,5,0)
+import           Data.Time.Format
+#else
 import           System.Locale
+#endif
 import           Text.XML.Cursor                (($//))
 import qualified Text.XML.Cursor                as Cu
 
diff --git a/Aws/S3/Commands/CopyObject.hs b/Aws/S3/Commands/CopyObject.hs
--- a/Aws/S3/Commands/CopyObject.hs
+++ b/Aws/S3/Commands/CopyObject.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 module Aws.S3.Commands.CopyObject
 where
 
@@ -14,7 +15,11 @@
 import           Data.Time
 import qualified Network.HTTP.Conduit as HTTP
 import           Text.XML.Cursor (($/), (&|))
+#if MIN_VERSION_time(1,5,0)
+import           Data.Time.Format
+#else
 import           System.Locale
+#endif
 
 data CopyMetadataDirective = CopyMetadata | ReplaceMetadata [(T.Text,T.Text)]
   deriving (Show)
diff --git a/Aws/S3/Commands/GetService.hs b/Aws/S3/Commands/GetService.hs
--- a/Aws/S3/Commands/GetService.hs
+++ b/Aws/S3/Commands/GetService.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 module Aws.S3.Commands.GetService
 where
 
@@ -5,7 +6,11 @@
 import           Aws.S3.Core
 import           Data.Maybe
 import           Data.Time.Format
+#if MIN_VERSION_time(1,5,0)
+import           Data.Time.Format
+#else
 import           System.Locale
+#endif
 import           Text.XML.Cursor  (($/), ($//), (&|))
 import qualified Data.Text        as T
 import qualified Text.XML.Cursor  as Cu
diff --git a/Aws/S3/Core.hs b/Aws/S3/Core.hs
--- a/Aws/S3/Core.hs
+++ b/Aws/S3/Core.hs
@@ -17,7 +17,11 @@
 import           Control.Applicative            ((<|>))
 import           Data.Time
 import           Data.Typeable
+#if MIN_VERSION_time(1,5,0)
+import           Data.Time.Format
+#else
 import           System.Locale
+#endif
 import           Text.XML.Cursor                (($/), (&|))
 import qualified Blaze.ByteString.Builder       as Blaze
 import qualified Blaze.ByteString.Builder.Char8 as Blaze8
diff --git a/Aws/Sqs/Core.hs b/Aws/Sqs/Core.hs
--- a/Aws/Sqs/Core.hs
+++ b/Aws/Sqs/Core.hs
@@ -1,3 +1,4 @@
+{-# LANGUAGE CPP #-}
 module Aws.Sqs.Core where
 
 import           Aws.Core
@@ -23,7 +24,11 @@
 import           Data.Typeable
 import qualified Network.HTTP.Conduit           as HTTP
 import qualified Network.HTTP.Types             as HTTP
+#if MIN_VERSION_time(1,5,0)
+import           Data.Time.Format
+#else
 import           System.Locale
+#endif
 import qualified Text.XML                       as XML
 import           Text.XML.Cursor                (($/))
 import qualified Text.XML.Cursor                as Cu
diff --git a/README.org b/README.org
--- a/README.org
+++ b/README.org
@@ -90,6 +90,10 @@
 
 ** 0.11 series
 
+- 0.11.1
+  - Support time 1.5
+  - Fix duplicate sending of query when using PostQuery
+
 - 0.11
   - New functions for running AWS transactions
   - Performance optimizations for DynamoDB and S3 MultiPartUpload
diff --git a/aws.cabal b/aws.cabal
--- a/aws.cabal
+++ b/aws.cabal
@@ -1,5 +1,5 @@
 Name:                aws
-Version:             0.11
+Version:             0.11.1
 Synopsis:            Amazon Web Services (AWS) for Haskell
 Description:         Bindings for Amazon Web Services (AWS), with the aim of supporting all AWS services. To see a high level overview of the library, see the README at <https://github.com/aristidb/aws/blob/master/README.org>.
 Homepage:            http://github.com/aristidb/aws
@@ -20,7 +20,7 @@
 Source-repository this
   type: git
   location: https://github.com/aristidb/aws.git
-  tag: 0.11
+  tag: 0.11.1
 
 Source-repository head
   type: git
