diff --git a/llvm/lib/Object/ArchiveWriter.cpp b/llvm/lib/Object/ArchiveWriter.cpp
index 114045561366d..c61ba868efe60 100644
--- a/llvm/lib/Object/ArchiveWriter.cpp
+++ b/llvm/lib/Object/ArchiveWriter.cpp
@@ -754,9 +754,8 @@ static Expected<std::vector<unsigned>> getSymbols(SymbolicFile *Obj,
       raw_string_ostream NameStream(Name);
       if (Error E = S.printName(NameStream))
         return std::move(E);
-      if (Map->find(Name) != Map->end())
+      if (!Map->try_emplace(Name, Index).second)
         continue; // ignore duplicated symbol
-      (*Map)[Name] = Index;
       if (Map == &SymMap->Map) {
         Ret.push_back(SymNames.tell());
         SymNames << Name << '\0';