diff --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index f04adf7fdf8ad..15d199e7f63fe 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -14903,7 +14903,7 @@ TreeTransform<Derived>::TransformExprRequirement(concepts::ExprRequirement *Req)
     TransRetReq.emplace(TPL);
   }
   assert(TransRetReq && "All code paths leading here must set TransRetReq");
-  if (Expr *E = TransExpr.dyn_cast<Expr *>())
+  if (Expr *E = dyn_cast<Expr *>(TransExpr))
     return getDerived().RebuildExprRequirement(E, Req->isSimple(),
                                                Req->getNoexceptLoc(),
                                                std::move(*TransRetReq));