diff --git a/lib/CodeGen/RegAllocBase.h b/lib/CodeGen/RegAllocBase.h
index a972fbf1108..d54363536f0 100644
--- a/lib/CodeGen/RegAllocBase.h
+++ b/lib/CodeGen/RegAllocBase.h
@@ -87,6 +87,8 @@ protected:
 
   RegAllocBase(): tri_(0), vrm_(0), lis_(0) {}
 
+  virtual ~RegAllocBase() {}
+
   // A RegAlloc pass should call this before allocatePhysRegs.
   void init(const TargetRegisterInfo &tri, VirtRegMap &vrm, LiveIntervals &lis);