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-rw-r--r--lib/mogilefs/bigfile/filter.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/mogilefs/bigfile/filter.rb b/lib/mogilefs/bigfile/filter.rb
index d831312..e3b6874 100644
--- a/lib/mogilefs/bigfile/filter.rb
+++ b/lib/mogilefs/bigfile/filter.rb
@@ -51,7 +51,7 @@ class MogileFS::Bigfile::Filter
     if @zi
       buf = @zi.inflate(buf)
     else
-      @md5 << buf
+      @md5.update(buf) if @md5
     end
     @io.write(buf)
   end