diff --git a/lib/CodeGen/Passes.cpp b/lib/CodeGen/Passes.cpp
index a7a8a53fa18..9d473fdb6cd 100644
--- a/lib/CodeGen/Passes.cpp
+++ b/lib/CodeGen/Passes.cpp
@@ -633,7 +633,7 @@ void TargetPassConfig::addMachineSSAOptimization() {
   addPass(&MachineCSEID, false);
   addPass(&MachineSinkingID);
 
-  addPass(&PeepholeOptimizerID, false);
+  addPass(&PeepholeOptimizerID);
   // Clean-up the dead code that may have been generated by peephole
   // rewriting.
   addPass(&DeadMachineInstructionElimID);