diff --git a/lib/devise/behaviors/http_header_authenticatable_behavior.rb b/lib/devise/behaviors/http_header_authenticatable_behavior.rb
index 616a501a..bca2388e 100644
--- a/lib/devise/behaviors/http_header_authenticatable_behavior.rb
+++ b/lib/devise/behaviors/http_header_authenticatable_behavior.rb
@@ -13,7 +13,7 @@ def valid_user?(headers)
     # Remote user is coming back from cosign as uniquename.
     # Append @umich.edu to this value to satisfy user model validations
     def remote_user(headers)
-      return "#{headers['HTTP_X_REMOTE_USER']}@umich.edu" if headers['HTTP_X_REMOTE_USER']
+      return "#{headers['HTTP_X_REMOTE_USER']}@umich.edu" if headers['HTTP_X_REMOTE_USER'].present?
       return nil
     end