diff --git a/lib/jekyll/configuration.rb b/lib/jekyll/configuration.rb
index 735b2c67..87bfeb46 100644
--- a/lib/jekyll/configuration.rb
+++ b/lib/jekyll/configuration.rb
@@ -286,8 +286,8 @@ module Jekyll
     def renamed_key(old, new, config, _ = nil)
       if config.key?(old)
         Jekyll::Deprecator.deprecation_message "The '#{old}' configuration" \
-          "option has been renamed to '#{new}'. Please update your config " \
-          "file accordingly."
+          " option has been renamed to '#{new}'. Please update your config" \
+          " file accordingly."
         config[new] = config.delete(old)
       end
     end