From 5e647db73f36681766ba2593bfeb3f20cf19a0f4 Mon Sep 17 00:00:00 2001
From: Eugene Toder <eltoder@users.noreply.github.com>
Date: Fri, 14 Nov 2025 14:42:58 -0500
Subject: [PATCH] Enable extrapolation for spreaded inflation curves

---
 QuantExt/qle/termstructures/spreadedinflationcurve.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/QuantExt/qle/termstructures/spreadedinflationcurve.cpp b/QuantExt/qle/termstructures/spreadedinflationcurve.cpp
index e9fc25e48..08e3e12a6 100644
--- a/QuantExt/qle/termstructures/spreadedinflationcurve.cpp
+++ b/QuantExt/qle/termstructures/spreadedinflationcurve.cpp
@@ -36,6 +36,7 @@ SpreadedZeroInflationCurve::SpreadedZeroInflationCurve(const Handle<ZeroInflatio
     interpolation_ = QuantLib::ext::make_shared<FlatExtrapolation>(
         QuantLib::ext::make_shared<LinearInterpolation>(times_.begin(), times_.end(), data_.begin()));
     interpolation_->enableExtrapolation();
+    enableExtrapolation(referenceCurve_->allowsExtrapolation());
     registerWith(referenceCurve_);
 }
 
@@ -85,6 +86,7 @@ SpreadedYoYInflationCurve::SpreadedYoYInflationCurve(const Handle<YoYInflationTe
     interpolation_ = QuantLib::ext::make_shared<FlatExtrapolation>(
         QuantLib::ext::make_shared<LinearInterpolation>(times_.begin(), times_.end(), data_.begin()));
     interpolation_->enableExtrapolation();
+    enableExtrapolation(referenceCurve_->allowsExtrapolation());
     registerWith(referenceCurve_);
 }
 QL_DEPRECATED_ENABLE_WARNING