diff --git a/llvm/lib/Transforms/Scalar/FlattenCFGPass.cpp b/llvm/lib/Transforms/Scalar/FlattenCFGPass.cpp
index 213d0f389c2e4..1335665e114dd 100644
--- a/llvm/lib/Transforms/Scalar/FlattenCFGPass.cpp
+++ b/llvm/lib/Transforms/Scalar/FlattenCFGPass.cpp
@@ -39,10 +39,11 @@ struct FlattenCFGLegacyPass : public FunctionPass {
 private:
   AliasAnalysis *AA;
 };
+} // namespace
 
 /// iterativelyFlattenCFG - Call FlattenCFG on all the blocks in the function,
 /// iterating until no more changes are made.
-bool iterativelyFlattenCFG(Function &F, AliasAnalysis *AA) {
+static bool iterativelyFlattenCFG(Function &F, AliasAnalysis *AA) {
   bool Changed = false;
   bool LocalChange = true;
 
@@ -67,7 +68,6 @@ bool iterativelyFlattenCFG(Function &F, AliasAnalysis *AA) {
   }
   return Changed;
 }
-} // namespace
 
 char FlattenCFGLegacyPass::ID = 0;