diff --git a/clang/lib/Sema/SemaDeclObjC.cpp b/clang/lib/Sema/SemaDeclObjC.cpp
index 18e07776aee3..f42c4b7546ce 100644
--- a/clang/lib/Sema/SemaDeclObjC.cpp
+++ b/clang/lib/Sema/SemaDeclObjC.cpp
@@ -1232,6 +1232,7 @@ Sema::FindProtocolDeclaration(bool WarnOnDeclarations, bool ForObjCContainer,
   }
 }
 
+namespace {
 // Callback to only accept typo corrections that are either
 // Objective-C protocols or valid Objective-C type arguments.
 class ObjCTypeArgOrProtocolValidatorCCC : public CorrectionCandidateCallback {
@@ -1282,6 +1283,7 @@ class ObjCTypeArgOrProtocolValidatorCCC : public CorrectionCandidateCallback {
     return false;
   }
 };
+} // end anonymous namespace
 
 void Sema::actOnObjCTypeArgsOrProtocolQualifiers(
        Scope *S,