diff --git a/include/llvm/Analysis/Dominators.h b/include/llvm/Analysis/Dominators.h
index af45646493f..47d3ded742a 100644
--- a/include/llvm/Analysis/Dominators.h
+++ b/include/llvm/Analysis/Dominators.h
@@ -105,6 +105,8 @@ struct DominatorSet : public DominatorSetBase {
   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
     AU.setPreservesAll();
   }
+private:
+  void calculateDominatorsFromBlock(BasicBlock *BB);
 };