diff --git a/psutil/tests/test_process_all.py b/psutil/tests/test_process_all.py
index ee1a9b58d..e59de3fb2 100755
--- a/psutil/tests/test_process_all.py
+++ b/psutil/tests/test_process_all.py
@@ -28,6 +28,7 @@
 from psutil import POSIX
 from psutil import WINDOWS
 from psutil._compat import PY3
+from psutil._compat import FileNotFoundError
 from psutil._compat import long
 from psutil._compat import unicode
 from psutil.tests import CI_TESTING