diff --git a/lib/jekyll/filters.rb b/lib/jekyll/filters.rb
index 55e91ee8..b7c8e6bb 100644
--- a/lib/jekyll/filters.rb
+++ b/lib/jekyll/filters.rb
@@ -222,7 +222,7 @@ module Jekyll
     def where(input, property, value)
       return input unless input.is_a?(Enumerable)
       input = input.values if input.is_a?(Hash)
-      input.select { |object| item_property(object, property).to_s == value.to_s or item_property(object, property).include? value.to_s }
+      input.select { |object| Array(item_property(object, property)).map(&:to_s).include?(value.to_s) }
     end
 
     # Sort an array of objects