diff --git a/Lib/test/test_posix.py b/Lib/test/test_posix.py
index 188f463..a6f02eb 100644
--- a/Lib/test/test_posix.py
+++ b/Lib/test/test_posix.py
@@ -236,7 +236,7 @@
         if hasattr(posix, 'getcwd'):
             dirname = 'getcwd-test-directory-0123456789abcdef-01234567890abcdef'
             curdir = os.getcwd()
-            base_path = os.path.abspath(test_support.TESTFN) + '.getcwd'
+            base_path = os.path.abspath(test_support.TESTFN[1:]) + '.getcwd'
 
             try:
                 os.mkdir(base_path)