diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 261fa5e..ee07211 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -464,7 +464,7 @@
   i2miMap_.resize(highestSlot + 1);
   for (Mi2IndexMap::iterator MI = mi2iMap_.begin(), ME = mi2iMap_.end();
        MI != ME; ++MI) {
-    i2miMap_[MI->second] = MI->first;
+    i2miMap_[MI->second] = const_cast<MachineInstr *>(MI->first);
   }
 
 }