diff --git a/linkcheck/memoryutil.py b/linkcheck/memoryutil.py
index 8c4915ee..513b8576 100644
--- a/linkcheck/memoryutil.py
+++ b/linkcheck/memoryutil.py
@@ -17,7 +17,6 @@
 """
 Memory utilities.
 """
-import sys
 import gc
 import pprint
 from . import strformat, log, LOG_CHECK