1 files changed, 3 insertions, 0 deletions
diff --git a/railties/lib/rails/application/configuration.rb b/railties/lib/rails/application/configuration.rb
index 819e801740..c3b91b8af9 100644
--- a/railties/lib/rails/application/configuration.rb
+++ b/railties/lib/rails/application/configuration.rb
@@ -78,6 +78,9 @@ module Rails
             assets.unknown_asset_fallback = false
           end
 
+        when "5.2"
+          load_defaults "5.1"
+
         else
           raise "Unknown version #{target_version.to_s.inspect}"
         end