diff --git a/sbysrc/sby_autotune.py b/sbysrc/sby_autotune.py
index b861890..aa40134 100644
--- a/sbysrc/sby_autotune.py
+++ b/sbysrc/sby_autotune.py
@@ -649,7 +649,7 @@ class SbyAutotuneTask(SbyTask):
     def engine_list(self):
         return [(self.candidate.engine_idx, self.candidate.engine)]
 
-    def copy_src(self):
+    def copy_src(self, _):
         pass
 
     def model(self, model_name):