diff --git a/lib/rhino/ruby_function.rb b/lib/rhino/ruby_function.rb
index 3be1147..49d7f68 100644
--- a/lib/rhino/ruby_function.rb
+++ b/lib/rhino/ruby_function.rb
@@ -8,7 +8,7 @@ module Rhino
     end
     
     def call(cxt, scope, this, args)
-      To.javascript @callable.call(*args.map {|a| To.ruby(a)})
+      To.javascript @callable.call(*Array(args).map {|a| To.ruby(a)})
     end
   end
 end
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