diff --git a/test/test_enter.py b/test/test_enter.py
index 106eb5c..d97ac2f 100644
--- a/test/test_enter.py
+++ b/test/test_enter.py
@@ -44,6 +44,7 @@ def test_enter(runner, yadm_y, paths, shell, success):
         assert 'does not refer to an executable' in run.out
     if 'env' in shell:
         assert f'GIT_DIR={paths.repo}' in run.out
+        assert f'GIT_WORK_TREE={paths.work}' in run.out
         assert f'PROMPT={prompt}' in run.out
         assert f'PS1={prompt}' in run.out
 
diff --git a/yadm b/yadm
index b5bd5cb..2bbecc8 100755
--- a/yadm
+++ b/yadm
@@ -919,6 +919,9 @@ function enter() {
     shell_cmd=('-c' "$*")
   fi
 
+  GIT_WORK_TREE=$(unix_path "$("$GIT_PROGRAM" config core.worktree)")
+  export GIT_WORK_TREE
+
   [ "${#shell_cmd[@]}" -eq 0 ] && echo "Entering yadm repo"
 
   yadm_prompt="yadm shell ($YADM_REPO) $shell_path > "