diff --git a/nipype/interfaces/base.py b/nipype/interfaces/base.py
index 00482e9e6b..15e510ded0 100644
--- a/nipype/interfaces/base.py
+++ b/nipype/interfaces/base.py
@@ -1660,7 +1660,7 @@ def _run_wrapper(self, runtime):
         runtime = self._run_interface(runtime)
         return runtime
 
-    def _run_interface(self, runtime, correct_return_codes=[0]):
+    def _run_interface(self, runtime, correct_return_codes=(0,)):
         """Execute command via subprocess
 
         Parameters