diff --git a/Lib/test/test_compiler.py b/Lib/test/test_compiler.py
index f58e6e5..6ec71ed 100644
--- a/Lib/test/test_compiler.py
+++ b/Lib/test/test_compiler.py
@@ -35,7 +35,9 @@
                     try:
                         compiler.compile(buf, basename, "exec")
                     except Exception, e:
-                        e.args[0] += "[in file %s]" % basename
+                        args = list(e.args)
+                        args[0] += "[in file %s]" % basename
+                        e.args = tuple(args)
                         raise
 
     def testNewClassSyntax(self):