diff --git a/lib/jekyll.rb b/lib/jekyll.rb
index 2d429c6c..8a27e161 100644
--- a/lib/jekyll.rb
+++ b/lib/jekyll.rb
@@ -70,7 +70,7 @@ module Jekyll
       STDOUT.puts "Configuration from #{config_file}"
     rescue => err
       STDERR.puts "WARNING: Could not read configuration. Using defaults (and options)."
-      STDERR.puts "\t" + err
+      STDERR.puts "\t" + err.to_s
       config = {}
     end