diff --git a/middleman-core/lib/middleman-core/util/hash_with_indifferent_access.rb b/middleman-core/lib/middleman-core/util/hash_with_indifferent_access.rb
index 7dd11845..3c934d9c 100644
--- a/middleman-core/lib/middleman-core/util/hash_with_indifferent_access.rb
+++ b/middleman-core/lib/middleman-core/util/hash_with_indifferent_access.rb
@@ -92,7 +92,7 @@ module Middleman
           self.class.new(data)
         elsif data.is_a? Array
           data.map(&method(:recursively_enhance)).freeze
-        elsif data.frozen? || data.nil? || [::TrueClass, ::FalseClass].include?(data.class)
+        elsif data.frozen? || data.nil? || [::TrueClass, ::FalseClass, ::Fixnum].include?(data.class)
           data
         else
           data.dup.freeze