diff --git a/app/models/impressionist/impressionable.rb b/app/models/impressionist/impressionable.rb
index ac3a4ca5..6b92a922 100644
--- a/app/models/impressionist/impressionable.rb
+++ b/app/models/impressionist/impressionable.rb
@@ -42,7 +42,7 @@ def impressionist_count(options={})
       # Count all distinct impressions unless the :all filter is provided.
       distinct = options[:filter] != :all
       if Rails::VERSION::MAJOR == 4
-        distinct ? imps.distinct.count(options[:filter]) : imps.count
+        distinct ? imps.count("DISTINCT #{self.class.connection.quote_column_name(options[:filter])}") : imps.count
       else
         distinct ? imps.count(options[:filter], :distinct => true) : imps.count
       end