diff --git a/clang/lib/Analysis/ThreadSafety.cpp b/clang/lib/Analysis/ThreadSafety.cpp
index b196ffa73cbfb8..9cc990bd35a3f8 100644
--- a/clang/lib/Analysis/ThreadSafety.cpp
+++ b/clang/lib/Analysis/ThreadSafety.cpp
@@ -418,7 +418,6 @@ class LocalVariableMap {
 private:
   Context::Factory ContextFactory;
   std::vector<VarDefinition> VarDefinitions;
-  std::vector<unsigned> CtxIndices;
   std::vector<std::pair<const Stmt *, Context>> SavedContexts;
 
 public:
@@ -731,8 +730,6 @@ void LocalVariableMap::traverseCFG(CFG *CFGraph,
                                    std::vector<CFGBlockInfo> &BlockInfo) {
   PostOrderCFGView::CFGBlockSet VisitedBlocks(CFGraph);
 
-  CtxIndices.resize(CFGraph->getNumBlockIDs());
-
   for (const auto *CurrBlock : *SortedGraph) {
     unsigned CurrBlockID = CurrBlock->getBlockID();
     CFGBlockInfo *CurrBlockInfo = &BlockInfo[CurrBlockID];