diff --git a/lld/MachO/Driver.cpp b/lld/MachO/Driver.cpp
--- a/lld/MachO/Driver.cpp
+++ b/lld/MachO/Driver.cpp
@@ -267,8 +267,9 @@
     // We don't take a reference to cachedFile here because the
     // loadArchiveMember() call below may recursively call addFile() and
     // invalidate this reference.
-    if (ArchiveFile *cachedFile = loadedArchives[path])
-      return cachedFile;
+    auto entry = loadedArchives.find(path);
+    if (entry != loadedArchives.end())
+      return entry->second;
 
     std::unique_ptr<object::Archive> archive = CHECK(
         object::Archive::create(mbref), path + ": failed to parse archive");