diff --git a/lib/Target/X86/X86FixupLEAs.cpp b/lib/Target/X86/X86FixupLEAs.cpp
index d21cb8aa076..fd42ecd3fac 100644
--- a/lib/Target/X86/X86FixupLEAs.cpp
+++ b/lib/Target/X86/X86FixupLEAs.cpp
@@ -125,6 +125,14 @@ FixupLEAPass::postRAConvertToLEA(MachineFunction::iterator &MFI,
       // which requires isImm() to be true
       return 0;
     }
+  case X86::ADD16rr:
+  case X86::ADD16rr_DB:
+    if (MI->getOperand(1).getReg() != MI->getOperand(2).getReg()) {
+      // if src1 != src2, then convertToThreeAddress will
+      // need to create a Virtual register, which we cannot do
+      // after register allocation.
+      return 0;
+    }
   }
   return TII->convertToThreeAddress(MFI, MBBI, 0);
 }