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-rw-r--r--lib/dtas/source/sox.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/dtas/source/sox.rb b/lib/dtas/source/sox.rb
index b4340fd..c4c65aa 100644
--- a/lib/dtas/source/sox.rb
+++ b/lib/dtas/source/sox.rb
@@ -71,7 +71,7 @@ class DTAS::Source::Sox # :nodoc:
         key, value = line.split('=', 2)
         key && value or next
         # TODO: multi-line/multi-value/repeated tags
-        tmp[key.upcase] = value
+        tmp[key.upcase.freeze] = value
       end
     end
     tmp