diff --git a/lib/paper_trail/serializers/yaml.rb b/lib/paper_trail/serializers/yaml.rb
index b3c9e707..b3b28d27 100644
--- a/lib/paper_trail/serializers/yaml.rb
+++ b/lib/paper_trail/serializers/yaml.rb
@@ -25,10 +25,10 @@ module PaperTrail
         # Need to check first (before) and secondary (after) fields
         if defined?(::YAML::ENGINE) && ::YAML::ENGINE.yamler == 'psych'
           arel_field.matches("%\n#{field}:\n- #{value}\n%").
-            or(arel_field.matches("%\n#{field}:\n- %\n- #{value}\n%"))
+            or(arel_field.matches("%\n#{field}:\n-%\n- #{value}\n%"))
         else # Syck adds extra spaces into array dumps
           arel_field.matches("%\n#{field}: \n- #{value}\n%").
-            or(arel_field.matches("%\n#{field}: \n- %\n- #{value}\n%"))
+            or(arel_field.matches("%\n#{field}: \n-%\n- #{value}\n%"))
         end
       end
     end