diff --git a/methods.py b/methods.py
index 012bbd8305a..7db490ba1f0 100644
--- a/methods.py
+++ b/methods.py
@@ -104,6 +104,10 @@ def update_version(module_version_string=""):
         head = open_utf8(os.path.join(gitfolder, "HEAD"), "r").readline().strip()
         if head.startswith("ref: "):
             ref = head[5:]
+            # If this directory is a Git worktree instead of a root clone.
+            parts = gitfolder.split("/")
+            if len(parts) > 2 and parts[-2] == "worktrees":
+                gitfolder = "/".join(parts[0:-2])
             head = os.path.join(gitfolder, ref)
             packedrefs = os.path.join(gitfolder, "packed-refs")
             if os.path.isfile(head):