diff --git a/server/prototype_project/app/application.rb b/server/prototype_project/app/application.rb
index 944180cd..64892c7f 100644
--- a/server/prototype_project/app/application.rb
+++ b/server/prototype_project/app/application.rb
@@ -25,7 +25,7 @@ class PickySearch < Application # The App Constant needs to be identical in appl
          ),
          field(:title,  :qualifiers => [:t, :title, :titre], :similarity => Similarity::DoubleLevenshtone.new(3)), # Up to three similar title word indexed.
          field(:author, :qualifiers => [:s, :author, :auteur]),
-         field(:isbn,   :qualifiers => [:i, :isbn])
+         field(:isbn,   :qualifiers => [:i, :isbn],          :partial => Partial::None.new) # Partially searching on an ISBN makes not much sense.
   end
   
   queries do