From b1f5cf7ee11b2cbf31e0ab8b6bfc3144e3944621 Mon Sep 17 00:00:00 2001
From: ferdymercury <ferdymercury@users.noreply.github.com>
Date: Wed, 15 Oct 2025 18:09:18 +0200
Subject: [PATCH] [RF] disable analytical integrals also with linear
 interpolation

Fixes https://github.com/root-project/root/issues/20116
---
 roofit/roofitcore/src/RooHistPdf.cxx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/roofit/roofitcore/src/RooHistPdf.cxx b/roofit/roofitcore/src/RooHistPdf.cxx
index 678a1e86c8086..7fed2e82bd4ac 100644
--- a/roofit/roofitcore/src/RooHistPdf.cxx
+++ b/roofit/roofitcore/src/RooHistPdf.cxx
@@ -319,7 +319,7 @@ Int_t RooHistPdf::getAnalyticalIntegral(RooArgSet& allVars,
   // Disable partial analytical integrals if interpolation is used, and we
   // integrate over sub-ranges, but leave them enabled when we integrate over
   // the full range of one or several variables
-  if (intOrder > 1 && !(code & 1)) {
+  if (intOrder > 0 && !(code & 1)) {
     analVars.removeAll();
     return 0;
   }