diff --git a/lib/logstash/filters/grok.rb b/lib/logstash/filters/grok.rb
index 89e8a66..f7a86e1 100644
--- a/lib/logstash/filters/grok.rb
+++ b/lib/logstash/filters/grok.rb
@@ -390,7 +390,11 @@ def patterns_files_from_paths(paths, glob)
 
         Dir.glob(path).each do |file|
           @logger.trace("Grok loading patterns from file", :path => file)
-          patternfiles << file unless File.directory?(file)
+          if File.directory?(file)
+            logger.debug("Skipping path because it is a directory", :path => file)
+          else
+            patternfiles << file
+          end
         end
       end
       patternfiles