diff --git a/Network/HTTP/Conduit/Cookies.hs b/Network/HTTP/Conduit/Cookies.hs
--- a/Network/HTTP/Conduit/Cookies.hs
+++ b/Network/HTTP/Conduit/Cookies.hs
@@ -137,7 +137,9 @@
                          -> CookieJar                   -- ^ Current cookie jar
                          -> UTCTime                     -- ^ Value that should be used as \"now\"
                          -> (Req.Request m, CookieJar)  -- ^ (Ouptut request, Updated cookie jar (last-access-time is updated))
-insertCookiesIntoRequest request cookie_jar now = (request {Req.requestHeaders = cookie_header : purgedHeaders}, cookie_jar')
+insertCookiesIntoRequest request cookie_jar now
+  | BS.null cookie_string = (request {Req.requestHeaders = purgedHeaders}, cookie_jar')
+  | otherwise = (request {Req.requestHeaders = cookie_header : purgedHeaders}, cookie_jar')
   where purgedHeaders = L.deleteBy (\ (a, _) (b, _) -> a == b) (CI.mk $ U.fromString "Cookie", BS.empty) $ Req.requestHeaders request
         (cookie_string, cookie_jar') = computeCookieString request cookie_jar now True
         cookie_header = (CI.mk $ U.fromString "Cookie", cookie_string)
diff --git a/http-conduit.cabal b/http-conduit.cabal
--- a/http-conduit.cabal
+++ b/http-conduit.cabal
@@ -1,5 +1,5 @@
 name:            http-conduit
-version:         1.4.1.6
+version:         1.4.1.7
 license:         BSD3
 license-file:    LICENSE
 author:          Michael Snoyman <michael@snoyman.com>