diff --git a/tests/bugs/gh_8187_test.py b/tests/bugs/gh_8187_test.py
index 8ffffb0f..f9389116 100644
--- a/tests/bugs/gh_8187_test.py
+++ b/tests/bugs/gh_8187_test.py
@@ -28,7 +28,7 @@ NOTES:
     Separated definition of MAX_RATIO value, it depends on OS.
     Linux results show that medians ratio is about 2.3 ... 2.6.
 """
-
+import os
 import psutil
 import pytest
 from firebird.qa import *