diff --git a/lld/ELF/Filesystem.cpp b/lld/ELF/Filesystem.cpp
--- a/lld/ELF/Filesystem.cpp
+++ b/lld/ELF/Filesystem.cpp
@@ -59,8 +59,21 @@
   sys::fs::remove(Path);
 
   // close and therefore remove TempPath in background.
-  if (!EC)
-    std::thread([=] { ::close(FD); }).detach();
+  if (!EC) {
+    std::mutex M;
+    std::condition_variable CV;
+    bool Started = false;
+    std::thread([&, FD] {
+      {
+        std::lock_guard<std::mutex> L(M);
+        Started = true;
+        CV.notify_all();
+      }
+      ::close(FD);
+    }).detach();
+    std::unique_lock<std::mutex> L(M);
+    CV.wait(L, [&] { return Started; });
+  }
 #endif
 }