diff --git a/contrib/windows/tests/tests.py b/contrib/windows/tests/tests.py
index cb2d15f39d3e..bdc3877f8ba0 100644
--- a/contrib/windows/tests/tests.py
+++ b/contrib/windows/tests/tests.py
@@ -118,7 +118,7 @@ def log_dl(when):
         #######################################################################
         preTest("regex for key file")
         with random_key(args.path / "key01.key", 32) as key01:
-            key01uri = "file:/" + str(path_to_unc(key01)).replace("\\", "/")
+            key01uri = "file:" + str(path_to_unc(key01)).replace("\\", "/")
 
             with zpool_create(
                 ctx,