Index: lib/acts_as_cached/cache_methods.rb
===================================================================
--- lib/acts_as_cached/cache_methods.rb	(revision 364)
+++ lib/acts_as_cached/cache_methods.rb	(working copy)
@@ -267,15 +267,15 @@
 
     # Ryan King
     def set_cache_with_associations
-      cache_options[:include].each do |assoc|
+      Array(cache_options[:include]).each do |assoc|
         send(assoc).reload
-      end if cache_options[:include]
+      end
       set_cache
     end
 
     # Lourens Naudé
     def expire_cache_with_associations(*associations_to_sweep)
-      ((cache_options[:include] || []) + associations_to_sweep).flatten.uniq.compact.each do |assoc|
+      (Array(cache_options[:include]) + associations_to_sweep).flatten.uniq.compact.each do |assoc|
         Array(send(assoc)).compact.each { |item| item.expire_cache if item.respond_to?(:expire_cache) }
       end 
       expire_cache