diff --git a/lib/redmine/thumbnail.rb b/lib/redmine/thumbnail.rb
index 9455e918e..1ab13dead 100644
--- a/lib/redmine/thumbnail.rb
+++ b/lib/redmine/thumbnail.rb
@@ -34,13 +34,13 @@ module Redmine
       return nil if is_pdf && !gs_available?
 
       unless File.exists?(target)
-        mime_type = File.open(source) {|f| MimeMagic.by_magic(f).try(:type) }
+        mime_type = File.open(source) {|f| MimeMagic.by_magic(f).try(:type)}
         return nil if mime_type.nil?
         return nil if !ALLOWED_TYPES.include? mime_type
         return nil if is_pdf && mime_type != "application/pdf"
 
         # Make sure we only invoke Imagemagick if the file type is allowed
-        unless File.open(source) {|f| ALLOWED_TYPES.include? MimeMagic.by_magic(f).try(:type) }
+        unless File.open(source) {|f| ALLOWED_TYPES.include? MimeMagic.by_magic(f).try(:type)}
           return nil
         end