diff --git a/lib/facebooker2/rack/post_canvas.rb b/lib/facebooker2/rack/post_canvas.rb
index 2958a1f..f148d00 100644
--- a/lib/facebooker2/rack/post_canvas.rb
+++ b/lib/facebooker2/rack/post_canvas.rb
@@ -12,8 +12,8 @@ def initialize(app)
     def call(env)
       request = Request.new(env)
       
-      if request.POST['signed_request']
-        env["REQUEST_METHOD"] = 'GET'
+      if request.POST['signed_request'] && request.params['_method'].blank?
+        env['REQUEST_METHOD'] = 'GET'
       end
       
       return @app.call(env)