diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index 962f0f7..ea21676 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -249,3 +249,10 @@
   else
     setCodeModel(CodeModel::Small);
 }
+
+DwarfLSDAEncoding::Encoding X86TargetMachine::getLSDAEncoding() const {
+  if (Subtarget.isTargetDarwin() && Subtarget.getDarwinVers() > 10)
+    return DwarfLSDAEncoding::FourByte;
+
+  return DwarfLSDAEncoding::Default;
+}
diff --git a/lib/Target/X86/X86TargetMachine.h b/lib/Target/X86/X86TargetMachine.h
index 6183e91..c42aa89 100644
--- a/lib/Target/X86/X86TargetMachine.h
+++ b/lib/Target/X86/X86TargetMachine.h
@@ -62,6 +62,8 @@
     return Subtarget.isTargetELF() ? &ELFWriterInfo : 0;
   }
 
+  virtual DwarfLSDAEncoding::Encoding getLSDAEncoding() const;
+
   // Set up the pass pipeline.
   virtual bool addInstSelector(PassManagerBase &PM, CodeGenOpt::Level OptLevel);
   virtual bool addPreRegAlloc(PassManagerBase &PM, CodeGenOpt::Level OptLevel);