diff --git a/include/llvm/Transforms/Utils/BuildLibCalls.h b/include/llvm/Transforms/Utils/BuildLibCalls.h
index bf97339399b..ac5f07e2d38 100644
--- a/include/llvm/Transforms/Utils/BuildLibCalls.h
+++ b/include/llvm/Transforms/Utils/BuildLibCalls.h
@@ -106,6 +106,7 @@ namespace llvm {
     virtual bool isFoldable(unsigned SizeCIOp, unsigned SizeArgOp,
                             bool isString) const = 0;
   public:
+    virtual ~SimplifyFortifiedLibCalls();
     bool fold(CallInst *CI, const TargetData *TD);
   };
 }
diff --git a/lib/Transforms/Utils/BuildLibCalls.cpp b/lib/Transforms/Utils/BuildLibCalls.cpp
index 82ccaea60c8..b44f0197604 100644
--- a/lib/Transforms/Utils/BuildLibCalls.cpp
+++ b/lib/Transforms/Utils/BuildLibCalls.cpp
@@ -343,6 +343,8 @@ void llvm::EmitFWrite(Value *Ptr, Value *Size, Value *File,
     CI->setCallingConv(Fn->getCallingConv());
 }
 
+SimplifyFortifiedLibCalls::~SimplifyFortifiedLibCalls() { }
+
 bool SimplifyFortifiedLibCalls::fold(CallInst *CI, const TargetData *TD) {
   this->CI = CI;
   StringRef Name = CI->getCalledFunction()->getName();