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-rw-r--r--lib/dtas/source/sox.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/dtas/source/sox.rb b/lib/dtas/source/sox.rb
index 0001689..e26f54b 100644
--- a/lib/dtas/source/sox.rb
+++ b/lib/dtas/source/sox.rb
@@ -11,6 +11,7 @@ class DTAS::Source::Sox # :nodoc:
 
   include DTAS::Source::File
   include DTAS::XS
+  extend DTAS::XS
 
   SOX_DEFAULTS = COMMAND_DEFAULTS.merge(
     "command" => 'exec sox "$INFILE" $SOXFMT - $TRIMFX $RGFX',