diff --git a/src/etc/generate-deriving-span-tests.py b/src/etc/generate-deriving-span-tests.py
index 2e9169ce5b94..d8a52893ea07 100755
--- a/src/etc/generate-deriving-span-tests.py
+++ b/src/etc/generate-deriving-span-tests.py
@@ -18,7 +18,7 @@ derives have spans that point to the fields, rather than the
 sample usage: src/etc/generate-deriving-span-tests.py
 """
 
-import sys, os, datetime, stat, re
+import os, datetime, stat, re
 
 TEST_DIR = os.path.abspath(
     os.path.join(os.path.dirname(__file__), '../test/compile-fail'))