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-rw-r--r--actionpack/lib/action_controller/metal/rendering.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_controller/metal/rendering.rb b/actionpack/lib/action_controller/metal/rendering.rb
index 70fd79bb8b..02a2e3db86 100644
--- a/actionpack/lib/action_controller/metal/rendering.rb
+++ b/actionpack/lib/action_controller/metal/rendering.rb
@@ -14,7 +14,7 @@ module ActionController
def render(*args) #:nodoc:
raise ::AbstractController::DoubleRenderError if response_body
super
- self.content_type ||= Mime[formats.first].to_s
+ self.content_type ||= Mime[lookup_context.rendered_format].to_s
response_body
end