diff --git a/lib/CodeGen/PostRASchedulerList.cpp b/lib/CodeGen/PostRASchedulerList.cpp
index 1f7833c47df..88d20dc5c82 100644
--- a/lib/CodeGen/PostRASchedulerList.cpp
+++ b/lib/CodeGen/PostRASchedulerList.cpp
@@ -461,6 +461,10 @@ void SchedulePostRATDList::FixupKills(MachineBasicBlock *MBB) {
     // are completely defined.
     for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
       MachineOperand &MO = MI->getOperand(i);
+      if (MO.isRegMask())
+        for (unsigned i = 0, e = TRI->getNumRegs(); i != e; ++i)
+          if (MO.clobbersPhysReg(i))
+            KillIndices[i] = ~0u;
       if (!MO.isReg()) continue;
       unsigned Reg = MO.getReg();
       if (Reg == 0) continue;