diff --git a/Gemfile b/Gemfile
index ad6fe10cade..9d460c91e28 100644
--- a/Gemfile
+++ b/Gemfile
@@ -43,16 +43,16 @@ if Plugin.installed?("bundler_lockfile_extensions")
       current = rails_version == CANVAS_RAILS && include_plugins
 
       add_lockfile(lockfile,
-                                            current: current,
-                                            prepare: prepare,
-                                            allow_mismatched_dependencies: rails_version != SUPPORTED_RAILS_VERSIONS.first,
-                                            enforce_pinned_additional_dependencies: include_plugins)
+                   current: current,
+                   prepare: prepare,
+                   allow_mismatched_dependencies: rails_version != SUPPORTED_RAILS_VERSIONS.first,
+                   enforce_pinned_additional_dependencies: include_plugins)
     end
 
     Dir["Gemfile.d/*.lock", "gems/*/Gemfile.lock", base: Bundler.root].each do |gem_lockfile_name|
       return unless add_lockfile(gem_lockfile_name,
-                                            gemfile: gem_lockfile_name.sub(/\.lock$/, ""),
-                                            allow_mismatched_dependencies: false)
+                                 gemfile: gem_lockfile_name.sub(/\.lock$/, ""),
+                                 allow_mismatched_dependencies: false)
     end
   end
 end
diff --git a/app/models/submission.rb b/app/models/submission.rb
index 940d09d44c9..b879c541705 100644
--- a/app/models/submission.rb
+++ b/app/models/submission.rb
@@ -2710,7 +2710,7 @@ class Submission < ActiveRecord::Base
   end
 
   def refresh_comment_read_state
-    unread_comments = visible_submission_comments.left_joins(:viewed_submission_comments).where.not(author: user).where(viewed_submission_comments: { id: nil }).exists?
+    unread_comments = visible_submission_comments.where.missing(:viewed_submission_comments).where.not(author: user).exists?
 
     if unread_comments
       mark_item_unread("comment")