diff --git a/lib/CodeGen/PreAllocSplitting.cpp b/lib/CodeGen/PreAllocSplitting.cpp
index e99c70c..16a9e6d 100644
--- a/lib/CodeGen/PreAllocSplitting.cpp
+++ b/lib/CodeGen/PreAllocSplitting.cpp
@@ -1238,7 +1238,7 @@
   }
 
   // Find a point to restore the value after the barrier.
-  unsigned RestoreIndex;
+  unsigned RestoreIndex = 0;
   MachineBasicBlock::iterator RestorePt =
     findRestorePoint(BarrierMBB, Barrier, LR->end, RefsInMBB, RestoreIndex);
   if (RestorePt == BarrierMBB->end())