diff --git a/plugins/filters.rb b/plugins/filters.rb
index 4976c732fc1..58d34f22daa 100644
--- a/plugins/filters.rb
+++ b/plugins/filters.rb
@@ -97,7 +97,7 @@ module Jekyll
         major = split_ver[0]
         minor = split_ver[1]
 
-        if minor.length == 1
+        if major.length == 4 || minor.length == 1
           "#{major}.X"
         else
           "#{major}.#{minor.chop}X"