diff --git a/lib/jekyll/readers/post_reader.rb b/lib/jekyll/readers/post_reader.rb
index 0663c658..b0dc3032 100644
--- a/lib/jekyll/readers/post_reader.rb
+++ b/lib/jekyll/readers/post_reader.rb
@@ -43,7 +43,7 @@ module Jekyll
               end
             end
           else
-            Jekyll.logger.debug "Skipping:", "#{doc.relative_path} is no valid UTF-8"
+            Jekyll.logger.debug "Skipping:", "#{doc.relative_path} is not valid UTF-8"
             false
           end
         end