diff --git a/lib/CodeGen/RegAllocBase.cpp b/lib/CodeGen/RegAllocBase.cpp
index 993dbc71ded..2b598e3a565 100644
--- a/lib/CodeGen/RegAllocBase.cpp
+++ b/lib/CodeGen/RegAllocBase.cpp
@@ -58,7 +58,6 @@ void RegAllocBase::init(VirtRegMap &vrm,
   VRM = &vrm;
   LIS = &lis;
   Matrix = &mat;
-  MRI->freezeReservedRegs(vrm.getMachineFunction());
   RegClassInfo.runOnMachineFunction(vrm.getMachineFunction());
 }