diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9b018c1feb7f..5f4a4c2f1bb9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,10 @@ This release contains breaking changes.
 - Plugins migrations. Each plugin can now have its own migration scripts if it needs to store data in your cluster. This is a step forward to improve Kong's pluggable architecture. [#443](https://github.com/Mashape/kong/pull/443)
 - The Basic Authentication plugin now supports credentials in the `Proxy-Authorization` header. [#460](https://github.com/Mashape/kong/issues/460)
 
+#### Changed
+
+- Basic Authentication and Key Authentication now require authentication parameters even when the `Expect: 100-continue` header is being sent. [#408](https://github.com/Mashape/kong/issues/408)
+
 ## [0.4.2] - 2015/08/10
 
 #### Added
diff --git a/kong/plugins/basicauth/access.lua b/kong/plugins/basicauth/access.lua
index ed0a4a0a04fa..f558e7e53903 100644
--- a/kong/plugins/basicauth/access.lua
+++ b/kong/plugins/basicauth/access.lua
@@ -8,11 +8,6 @@ local PROXY_AUTHORIZATION = "proxy-authorization"
 
 local _M = {}
 
-local function skip_authentication(headers)
-  -- Skip upload request that expect a 100 Continue response
-  return headers["expect"] and stringy.startswith(headers["expect"], "100")
-end
-
 -- Fast lookup for credential retrieval depending on the type of the authentication
 --
 -- All methods must respect:
@@ -89,8 +84,6 @@ local function load_credential(username)
 end
 
 function _M.execute(conf)
-  if skip_authentication(ngx.req.get_headers()) then return end
-
   -- If both headers are missing, return 401
   if not (ngx.req.get_headers()[AUTHORIZATION] or ngx.req.get_headers()[PROXY_AUTHORIZATION]) then
     ngx.ctx.stop_phases = true
diff --git a/kong/plugins/keyauth/access.lua b/kong/plugins/keyauth/access.lua
index dd58f60244ef..5a96c4e5b482 100644
--- a/kong/plugins/keyauth/access.lua
+++ b/kong/plugins/keyauth/access.lua
@@ -11,11 +11,6 @@ local MULTIPART_DATA = "multipart/form-data"
 
 local _M = {}
 
-local function skip_authentication(headers)
-  -- Skip upload request that expect a 100 Continue response
-  return headers["expect"] and stringy.startswith(headers["expect"], "100")
-end
-
 local function get_key_from_query(key_name, request, conf)
   local key, parameters
   local found_in = {}
@@ -116,8 +111,6 @@ local retrieve_credentials = {
 }
 
 function _M.execute(conf)
-  if skip_authentication(ngx.req.get_headers()) then return end
-
   local key, key_found, credential
   for _, v in ipairs({ constants.AUTHENTICATION.QUERY, constants.AUTHENTICATION.HEADER }) do
     key = retrieve_credentials[v](ngx.req, conf)