diff --git a/src/nim_lk.nim b/src/nim_lk.nim
index df3f6e8..3cdf637 100644
--- a/src/nim_lk.nim
+++ b/src/nim_lk.nim
@@ -64,8 +64,8 @@ proc gitLsRemote(url: string; withTags: bool): seq[tuple[tag: string, rev: strin
 proc matchRev(url: string; wanted: VersionRange): tuple[tag: string, rev: string] =
   if wanted.kind == verSpecial:
     let special = string(wanted.spe)
-    if special.len == 41 and special[0] == '#':
-      result[1] = special[1..39]
+    if special[0] == '#':
+      result[1] = special[1..special.high]
     else:
       quit("unhandled version " & url & " " & $wanted)
   else:
@@ -120,9 +120,7 @@ proc prefetchGit(uri: Uri; version: VersionRange): Preserve =
   var archiveUri = uri
   archiveUri.scheme = "https"
   archiveUri.path.removeSuffix ".git"
-  archiveUri.path.add "/archive/"
-  archiveUri.path.add rev
-  archiveUri.path.add ".tar.gz"
+  archiveUri.path = archiveUri.path / "archive"/ rev & ".tar.gz"
   let client = newHttpClient()
   defer: close(client)
   let