diff --git a/lib/jekyll/configuration.rb b/lib/jekyll/configuration.rb
index b4bf7c5a..1e2ca01c 100644
--- a/lib/jekyll/configuration.rb
+++ b/lib/jekyll/configuration.rb
@@ -137,7 +137,7 @@ module Jekyll
         SafeYAML.load_file(filename) || {}
       else
         raise ArgumentError, "No parser for '#{filename}' is available.
-          Use a .toml or .y(a)ml file instead."
+          Use a .y(a)ml or .toml file instead."
       end
     end