From 1ca79ea4d945b92c0a166b6f4c4397ed4bd7cf4d Mon Sep 17 00:00:00 2001
From: shahoian <ruben.shahoyan@cern.ch>
Date: Tue, 24 Feb 2026 08:39:51 +0100
Subject: [PATCH] Fix missing accumulate of covmatrix in fall-back case

---
 Common/DCAFitter/include/DCAFitter/DCAFitterN.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Common/DCAFitter/include/DCAFitter/DCAFitterN.h b/Common/DCAFitter/include/DCAFitter/DCAFitterN.h
index 1adf7a9ae7329..2641dec84aed9 100644
--- a/Common/DCAFitter/include/DCAFitter/DCAFitterN.h
+++ b/Common/DCAFitter/include/DCAFitter/DCAFitterN.h
@@ -818,6 +818,7 @@ GPUd() o2::math_utils::SMatrix<double, 3, 3, o2::math_utils::MatRepSym<double, 3
   MatSym3D covmSum;
   for (int i = N; i--;) {
     MatSym3D covTr = o2::math_utils::Similarity(getTrackRotMatrix(i), getTrackCovMatrix(i, cand));
+    covmSum += covTr;
   }
   return covmSum;
 }