diff --git a/lib/CodeGen/TailDuplication.cpp b/lib/CodeGen/TailDuplication.cpp
index e6eb2e755bf..5fe3cb09ff3 100644
--- a/lib/CodeGen/TailDuplication.cpp
+++ b/lib/CodeGen/TailDuplication.cpp
@@ -239,7 +239,7 @@ bool TailDuplicatePass::TailDuplicateBlocks(MachineFunction &MF) {
             MachineOperand &UseMO = UI.getOperand();
             MachineInstr *UseMI = &*UI;
             ++UI;
-            if (UseMI->getParent() == DefBB)
+            if (UseMI->getParent() == DefBB && !UseMI->isPHI())
               continue;
             SSAUpdate.RewriteUse(UseMO);
           }