diff --git a/lld/MachO/LTO.cpp b/lld/MachO/LTO.cpp
--- a/lld/MachO/LTO.cpp
+++ b/lld/MachO/LTO.cpp
@@ -59,6 +59,7 @@
     c.MllvmArgs.emplace_back(C.str());
   c.CodeModel = getCodeModelFromCMModel();
   c.CPU = getCPUStr();
+  c.DefaultTriple = getTargetTripleName(config->platformInfo.target);
   c.MAttrs = getMAttrs();
   c.DiagHandler = diagnosticHandler;
   c.PreCodeGenPassesHook = [](legacy::PassManager &pm) {
diff --git a/lld/test/MachO/lto-object-path.ll b/lld/test/MachO/lto-object-path.ll
--- a/lld/test/MachO/lto-object-path.ll
+++ b/lld/test/MachO/lto-object-path.ll
@@ -2,12 +2,17 @@
 ; UNSUPPORTED: system-windows
 
 ; RUN: rm -rf %t; mkdir %t
+; RUN: llc -filetype=obj %s -o %t/test-obj.o
 ; RUN: opt -thinlto-bc %s -o %t/test.o
 ; RUN: opt %s -o %t/test-nonthin.o
 
 ; RUN: %lld %t/test.o -o %t/test
 ; RUN: llvm-nm -pa %t/test | FileCheck %s --check-prefixes CHECK,NOOBJPATH
 
+; RUN: %lld %t/test-obj.o -o %t/test-obj -object_path_lto %t/lto-temps-obj
+; RUN: llvm-nm -pa %t/test-obj | FileCheck %s --check-prefixes CHECK,NOLTOPATH -DDIR=%t
+; RUN: llvm-otool -l %t/lto-temps-obj/0.x86_64.lto.o | FileCheck %s --check-prefixes=MINOS-DEFAULT
+
 ; RUN: ZERO_AR_DATE=0 %lld %t/test.o -o %t/test -object_path_lto %t/lto-temps
 ; RUN: llvm-nm -pa %t/test | FileCheck %s --check-prefixes CHECK,OBJPATH-DIR -DDIR=%t/lto-temps
 
@@ -31,10 +36,12 @@
 ; RUN: touch %t/lto-tmp.o
 ; RUN: ZERO_AR_DATE=0 %lld %t/test-nonthin.o -o %t/test -object_path_lto %t/lto-tmp.o
 ; RUN: llvm-nm -pa %t/test | FileCheck %s --check-prefixes CHECK,OBJPATH-FILE -DFILE=%t/lto-tmp.o
+; RUN: llvm-otool -l %t/lto-tmp.o | FileCheck %s --check-prefixes=MINOS
 
 
 ; CHECK:             0000000000000000                - 00 0000    SO /tmp/test.cpp
 ; NOOBJPATH-NEXT:    0000000000000000                - 03 0001   OSO /tmp/lto.tmp
+; NOLTOPATH-NEXT:    0000000000000000                - 03 0001   OSO [[DIR]]/test-obj.o
 ;; check that modTime is nonzero when `-object_path_lto` is provided
 ; OBJPATH-DIR-NEXT:  {{[0-9a-f]*[1-9a-f]+[0-9a-f]*}} - 03 0001   OSO [[DIR]]/1.x86_64.lto.o
 ; OBJPATH-FILE-NEXT: {{[0-9a-f]*[1-9a-f]+[0-9a-f]*}} - 03 0001   OSO [[FILE]]
@@ -45,6 +52,9 @@
 ; DSYM: DW_AT_name ("test.cpp")
 ; HARDLINK: 2
 
+; MINOS: 10.15
+; MINOS-DEFAULT: 11.0
+
 target triple = "x86_64-apple-macosx10.15.0"
 target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"