diff --git a/app/models/app_settings.rb b/app/models/app_settings.rb
index 3f8335e..4425a22 100644
--- a/app/models/app_settings.rb
+++ b/app/models/app_settings.rb
@@ -48,8 +48,8 @@ class AppSettings < RailsSettings::Base
   field :student_check_status_accepted
   field :student_check_status_published
   field :student_check_status_rejected
-  field :primary_thesis_file_extensions
-  field :supplemental_thesis_file_extensions
-  field :licence_file_extensions
-  field :embargo_file_extensions
+  field :primary_thesis_file_extensions, default: ".pdf"
+  field :supplemental_thesis_file_extensions, default: ".pdf, .doc, .docx, .txt, .html, .htm, .odt, .odp, .ods, .png, .tif, .jpg, .csv, .xml, .avi, .flac, .wav, .mp3, .mp4, .mov"
+  field :licence_file_extensions, default: ".pdf"
+  field :embargo_file_extensions, default: ".pdf, .txt, .html, .htm, .odt, .odp, .ods"
 end