diff --git a/llvm/lib/LTO/LTOBackend.cpp b/llvm/lib/LTO/LTOBackend.cpp
--- a/llvm/lib/LTO/LTOBackend.cpp
+++ b/llvm/lib/LTO/LTOBackend.cpp
@@ -519,6 +519,8 @@
     return TOrErr.takeError();
 
   std::unique_ptr<TargetMachine> TM = createTargetMachine(C, *TOrErr, *Mod);
+  if (TM)
+    Mod->setDataLayout(TM->createDataLayout());
 
   if (!C.CodeGenOnly) {
     if (!opt(C, TM.get(), 0, *Mod, /*IsThinLTO=*/false,
@@ -567,6 +569,8 @@
     return TOrErr.takeError();
 
   std::unique_ptr<TargetMachine> TM = createTargetMachine(Conf, *TOrErr, Mod);
+  if (TM)
+    Mod.setDataLayout(TM->createDataLayout());
 
   // Setup optimization remarks.
   auto DiagFileOrErr = lto::setupLLVMOptimizationRemarks(
diff --git a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
--- a/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
+++ b/llvm/lib/LTO/ThinLTOCodeGenerator.cpp
@@ -232,6 +232,8 @@
 static void optimizeModule(Module &TheModule, TargetMachine &TM,
                            unsigned OptLevel, bool Freestanding,
                            ModuleSummaryIndex *Index) {
+  TheModule.setDataLayout(TM.createDataLayout());
+
   // Populate the PassManager
   PassManagerBuilder PMB;
   PMB.LibraryInfo = new TargetLibraryInfoImpl(TM.getTargetTriple());