diff --git a/src/future/backports/test/support.py b/src/future/backports/test/support.py
index 6639372b..0ab81fff 100644
--- a/src/future/backports/test/support.py
+++ b/src/future/backports/test/support.py
@@ -1942,7 +1942,7 @@ def can_xattr():
                     os.setxattr(fp.fileno(), b"user.test", b"")
                     # Kernels < 2.6.39 don't respect setxattr flags.
                     kernel_version = platform.release()
-                    m = re.match("2.6.(\d{1,2})", kernel_version)
+                    m = re.match(r"2.6.(\d{1,2})", kernel_version)
                     can = m is None or int(m.group(1)) >= 39
                 except OSError:
                     can = False