diff --git a/copyparty/__main__.py b/copyparty/__main__.py
index d4f8e2fd..4fe54990 100755
--- a/copyparty/__main__.py
+++ b/copyparty/__main__.py
@@ -749,7 +749,7 @@ def run_argparse(argv: list[str], formatter: Any, retry: bool) -> argparse.Names
     ap2.add_argument("--no-scandir", action="store_true", help="disable scandir; instead using listdir + stat on each file")
     ap2.add_argument("--no-fastboot", action="store_true", help="wait for up2k indexing before starting the httpd")
     ap2.add_argument("--no-htp", action="store_true", help="disable httpserver threadpool, create threads as-needed instead")
-    ap2.add_argument("--stackmon", metavar="P,S", type=u, help="write stacktrace to Path every S second, for example --stackmon=./st/%Y-%m/%d/%H%M.xz,60")
+    ap2.add_argument("--stackmon", metavar="P,S", type=u, help="write stacktrace to Path every S second, for example --stackmon=./st/%%Y-%%m/%%d/%%H%%M.xz,60")
     ap2.add_argument("--log-thrs", metavar="SEC", type=float, help="list active threads every SEC")
     ap2.add_argument("--log-fk", metavar="REGEX", type=u, default="", help="log filekey params for files where path matches REGEX; '.' (a single dot) = all files")
     # fmt: on
diff --git a/copyparty/up2k.py b/copyparty/up2k.py
index 047911da..69cc6e39 100644
--- a/copyparty/up2k.py
+++ b/copyparty/up2k.py
@@ -2133,13 +2133,9 @@ class Up2k(object):
                 raise OSError(38, "filesystem does not have st_dev")
             elif fs1 == fs2:
                 # same fs; make symlink as relative as possible
-                v = []
-                for p in [src, dst]:
-                    if WINDOWS:
-                        p = p.replace("\\", "/")
-                    v.append(p.split("/"))
-
-                nsrc, ndst = v
+                spl = r"[\\/]" if WINDOWS else "/"
+                nsrc = re.split(spl, src)
+                ndst = re.split(spl, dst)
                 nc = 0
                 for a, b in zip(nsrc, ndst):
                     if a != b:
@@ -2150,6 +2146,10 @@ class Up2k(object):
                     hops = len(ndst[nc:]) - 1
                     lsrc = "../" * hops + "/".join(zsl)
 
+            if WINDOWS:
+                lsrc = lsrc.replace("/", "\\")
+                ldst = ldst.replace("/", "\\")
+
             try:
                 if self.args.hardlink:
                     os.link(fsenc(src), fsenc(dst))