diff --git a/llvm/lib/Target/X86/X86CondBrFolding.cpp b/llvm/lib/Target/X86/X86CondBrFolding.cpp
index 8b9ef20..1d22193 100644
--- a/llvm/lib/Target/X86/X86CondBrFolding.cpp
+++ b/llvm/lib/Target/X86/X86CondBrFolding.cpp
@@ -84,6 +84,7 @@
   return new X86CondBrFoldingPass();
 }
 
+namespace {
 // A class the stores the auxiliary information for each MBB.
 struct TargetMBBInfo {
   MachineBasicBlock *TBB;
@@ -129,6 +130,7 @@
     return MBBInfos[MBB->getNumber()].get();
   }
 };
+} // namespace
 
 // Find a valid path that we can reuse the CondCode.
 // The resulted path (if return true) is stored in BranchPath.