diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index f03db74..26d019b 100644
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -143,7 +143,7 @@
     LowSpillSlot = SS;
   if (HighSpillSlot == NO_STACK_SLOT || SS > HighSpillSlot)
     HighSpillSlot = SS;
-  I->second = SS;
+  EmergencySpillSlots[RC] = SS;
   return SS;
 }