diff --git a/config/examples/amazon_s3.yml b/config/examples/amazon_s3.yml
index 1185b6fdde..3808ef7aff 100644
--- a/config/examples/amazon_s3.yml
+++ b/config/examples/amazon_s3.yml
@@ -13,7 +13,7 @@ s3: &s3
   force_path_style: <%= ENV['AWS_PATH_STYLE'].presence || false %>
 
 development:
-  <<: *<%= ENV['FILE_UPLOAD_STORAGE'].presence || 'default' %>
+  <<: *<%= ENV['FILE_UPLOAD_STORAGE'] == 's3' ? 's3' : 'default' %>
 
 test: &test
   access_key_id: invalid
@@ -22,4 +22,4 @@ test: &test
   region: "us-east-1"
 
 production:
-  <<: *<%= ENV['FILE_UPLOAD_STORAGE'].presence || 'default' %>
+  <<: *<%= ENV['FILE_UPLOAD_STORAGE'] == 's3' ? 's3' : 'default' %>