diff --git a/Network/HTTP/Client/Request.hs b/Network/HTTP/Client/Request.hs
--- a/Network/HTTP/Client/Request.hs
+++ b/Network/HTTP/Client/Request.hs
@@ -372,4 +372,4 @@
 --
 -- Since 0.3.6
 setQueryString :: [(S.ByteString, Maybe S.ByteString)] -> Request -> Request
-setQueryString qs req = req { queryString = W.renderQuery False qs }
+setQueryString qs req = req { queryString = W.renderQuery True qs }
diff --git a/http-client.cabal b/http-client.cabal
--- a/http-client.cabal
+++ b/http-client.cabal
@@ -1,5 +1,5 @@
 name:                http-client
-version:             0.3.7.1
+version:             0.3.7.2
 synopsis:            An HTTP client engine, intended as a base layer for more user-friendly packages.
 description:         This codebase has been refactored from http-conduit.
 homepage:            https://github.com/snoyberg/http-client