diff --git a/pillar/application/modules/file_storage.py b/pillar/application/modules/file_storage.py
index 5a66086e..08b37ba9 100644
--- a/pillar/application/modules/file_storage.py
+++ b/pillar/application/modules/file_storage.py
@@ -41,6 +41,7 @@ file_storage = Blueprint('file_storage', __name__,
 
 # Add our own extensions to the mimetypes package
 mimetypes.add_type('application/x-blender', '.blend')
+mimetypes.add_type('application/x-radiance-hdr', '.hdr')
 
 
 @file_storage.route('/gcs/<bucket_name>/<subdir>/')