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-rw-r--r--actionmailer/lib/action_mailer/collector.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/actionmailer/lib/action_mailer/collector.rb b/actionmailer/lib/action_mailer/collector.rb
index 569a09bd2a..cbb2778fae 100644
--- a/actionmailer/lib/action_mailer/collector.rb
+++ b/actionmailer/lib/action_mailer/collector.rb
@@ -21,7 +21,7 @@ module ActionMailer
alias :all :any
def custom(mime, options={})
- options.reverse_merge!(:content_type => mime.to_s)
+ options.reverse_merge!(content_type: mime.to_s)
@context.formats = [mime.to_sym]
options[:body] = block_given? ? yield : @default_render.call
@responses << options