lib/sprockets/helpers.rb in sprockets-helpers-1.2.0 vs lib/sprockets/helpers.rb in sprockets-helpers-1.2.1

@@ -37,10 +37,10 @@
 
       # The base URL the Sprocket environment is mapped to.
       # This defaults to '/assets'.
       def prefix
         @prefix ||= '/assets'
-        @prefix.respond_to?(:first) ? "/#{@prefix.first}" : @prefix
+        @prefix.is_a?(Array) ? "/#{@prefix.first}" : @prefix
       end
       attr_writer :prefix
 
       # Customize the protocol when using asset hosts.
       # If the value is :relative, A relative protocol ('//')