diff --git a/lib/linguist/blob_helper.rb b/lib/linguist/blob_helper.rb
index 6c203b9f..911806b6 100644
--- a/lib/linguist/blob_helper.rb
+++ b/lib/linguist/blob_helper.rb
@@ -279,7 +279,7 @@ module Linguist
     #
     # Returns true of false.
     def xcode_project_file?
-      ['.xib', '.nib', '.pbxproj', '.xcworkspacedata', '.xcuserstate'].include?(extname)
+      ['.xib', '.nib', '.storyboard', '.pbxproj', '.xcworkspacedata', '.xcuserstate'].include?(extname)
     end
 
     # Internal: Is the blob minified JS?