diff -r ddf61aa73384 -r 8701caf9edf0 pyramid_cubicweb/core.py
--- a/pyramid_cubicweb/core.py	Thu Aug 28 15:42:51 2014 +0200
+++ b/pyramid_cubicweb/core.py	Tue Sep 02 20:49:57 2014 +0200
@@ -59,7 +59,7 @@
         vreg = request.registry['cubicweb.registry']
         https = request.scheme == 'https'
 
-        post = request.params
+        post = request.params.mixed()
         headers_in = request.headers
 
         super(CubicWebPyramidRequest, self).__init__(vreg, https, post,