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-rw-r--r--actionpack/lib/action_dispatch/http/response.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionpack/lib/action_dispatch/http/response.rb b/actionpack/lib/action_dispatch/http/response.rb
index 516a2af69a..dc159596c4 100644
--- a/actionpack/lib/action_dispatch/http/response.rb
+++ b/actionpack/lib/action_dispatch/http/response.rb
@@ -425,7 +425,7 @@ module ActionDispatch # :nodoc:
def set_content_type(content_type, charset)
type = (content_type || "").dup
- type << "; charset=#{charset}" if charset
+ type << "; charset=#{charset.to_s.downcase}" if charset
set_header CONTENT_TYPE, type
end