diff --git a/llvm/lib/CodeGen/DFAPacketizer.cpp b/llvm/lib/CodeGen/DFAPacketizer.cpp
index 840a101..6619bcf 100644
--- a/llvm/lib/CodeGen/DFAPacketizer.cpp
+++ b/llvm/lib/CodeGen/DFAPacketizer.cpp
@@ -160,7 +160,8 @@
                                       MachineBasicBlock::iterator EndItr) {
   assert(VLIWScheduler && "VLIW Scheduler is not initialized!");
   VLIWScheduler->startBlock(MBB);
-  VLIWScheduler->enterRegion(MBB, BeginItr, EndItr, MBB->size());
+  VLIWScheduler->enterRegion(MBB, BeginItr, EndItr,
+                             std::distance(BeginItr, EndItr));
   VLIWScheduler->schedule();
 
   // Generate MI -> SU map.