diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 82389b2..b4bbb66 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -823,6 +823,10 @@
   r2iMap_.erase(SrcReg);
   r2rMap_[SrcReg] = DstReg;
 
+  // Finally, delete the copy instruction.
+  RemoveMachineInstrFromMaps(CopyMI);
+  CopyMI->eraseFromParent();
+  ++numPeep;
   ++numJoins;
   return true;
 }