diff --git a/include/llvm/Transforms/Utils/SimplifyLibCalls.h b/include/llvm/Transforms/Utils/SimplifyLibCalls.h
index c7f5bb026c6..3b99a8cdcf1 100644
--- a/include/llvm/Transforms/Utils/SimplifyLibCalls.h
+++ b/include/llvm/Transforms/Utils/SimplifyLibCalls.h
@@ -36,6 +36,9 @@ private:
   const TargetLibraryInfo *TLI;
   bool UnsafeFPShrink;
 
+protected:
+  ~LibCallSimplifier() {}
+
 public:
   LibCallSimplifier(const DataLayout *TD, const TargetLibraryInfo *TLI,
                     bool UnsafeFPShrink);
diff --git a/lib/Transforms/InstCombine/InstructionCombining.cpp b/lib/Transforms/InstCombine/InstructionCombining.cpp
index 26f243cb150..ac0c01e3c7b 100644
--- a/lib/Transforms/InstCombine/InstructionCombining.cpp
+++ b/lib/Transforms/InstCombine/InstructionCombining.cpp
@@ -2908,7 +2908,7 @@ bool InstCombiner::DoOneIteration(Function &F, unsigned Iteration) {
 }
 
 namespace {
-class InstCombinerLibCallSimplifier : public LibCallSimplifier {
+class InstCombinerLibCallSimplifier final : public LibCallSimplifier {
   InstCombiner *IC;
 public:
   InstCombinerLibCallSimplifier(const DataLayout *DL,