diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp
index 15036e38b89..e1994fc889c 100644
--- a/lib/CodeGen/RegAllocFast.cpp
+++ b/lib/CodeGen/RegAllocFast.cpp
@@ -433,7 +433,7 @@ unsigned RAFast::calcSpillCost(unsigned PhysReg) const {
     return LiveVirtRegs.lookup(VirtReg).Dirty ? spillDirty : spillClean;
   }
 
-  // This is a disabled register, add up const of aliases.
+  // This is a disabled register, add up cost of aliases.
   unsigned Cost = 0;
   for (const unsigned *AS = TRI->getAliasSet(PhysReg);
        unsigned Alias = *AS; ++AS) {