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-rw-r--r--lib/paperclip/type_corrector.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/paperclip/type_corrector.rb b/lib/paperclip/type_corrector.rb
index 17e2fc5da..030b98b12 100644
--- a/lib/paperclip/type_corrector.rb
+++ b/lib/paperclip/type_corrector.rb
@@ -7,7 +7,7 @@ module Paperclip
     def make
       return @file unless options[:format]
 
-      target_extension = '.' + options[:format]
+      target_extension = ".#{options[:format]}"
       extension        = File.extname(attachment.instance_read(:file_name))
 
       return @file unless options[:style] == :original && target_extension && extension != target_extension