diff --git a/lib/noosfero/plugin/spammable.rb b/lib/noosfero/plugin/spammable.rb
index 78d38a6..d220bd8 100644
--- a/lib/noosfero/plugin/spammable.rb
+++ b/lib/noosfero/plugin/spammable.rb
@@ -1,13 +1,15 @@
-Spammable.module_eval do
-  def marked_as_spam
-    plugins.dispatch(:marked_as_spam, self)
-  end
+Rails.configuration.to_prepare do
+  Spammable.module_eval do
+    def marked_as_spam
+      plugins.dispatch(:marked_as_spam, self)
+    end
 
-  def marked_as_ham
-    plugins.dispatch(:marked_as_ham, self)
-  end
+    def marked_as_ham
+      plugins.dispatch(:marked_as_ham, self)
+    end
 
-  def check_for_spam
-    plugins.dispatch(:check_for_spam, self)
+    def check_for_spam
+      plugins.dispatch(:check_for_spam, self)
+    end
   end
 end
--
libgit2 0.21.2