diff --git a/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php b/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php
--- a/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php
+++ b/src/workingcopyidentity/ArcanistWorkingCopyIdentity.php
@@ -180,6 +180,16 @@
 
     $identity = new ArcanistWorkingCopyIdentity($project_root, $config);
     $identity->localMetaDir = $vcs_root.'/.'.$vcs_type;
+    if ($vcs_type == 'git' && !is_dir($identity->localMetaDir)) {
+      /* Find the .git directory for git-worktrees: */
+      list($gitdir) = execx('git rev-parse --git-dir');
+      $identity->localMetaDir = trim($gitdir);
+      $console->writeLog(
+        "%s\n",
+        pht(
+          'Working Copy: Git dir for worktree "%s" is at "%s".',
+          $vcs_root, $identity->localMetaDir));
+    }
     $identity->localConfig = $identity->readLocalArcConfig();
     $identity->vcsType = $vcs_type;
     $identity->vcsRoot = $vcs_root;