diff --git a/lib/AST/ExprConstant.cpp b/lib/AST/ExprConstant.cpp
index e2d5c75..6b88246 100644
--- a/lib/AST/ExprConstant.cpp
+++ b/lib/AST/ExprConstant.cpp
@@ -2832,6 +2832,8 @@
 }
 
 bool LValueExprEvaluator::VisitVarDecl(const Expr *E, const VarDecl *VD) {
+  if (VD->isThreadSpecified())
+    return false;
   if (!VD->getType()->isReferenceType()) {
     if (isa<ParmVarDecl>(VD)) {
       Result.set(VD, Info.CurrentCall->Index);