From 80b28c88e2cc2956177cc6603e52363fee179e23 Mon Sep 17 00:00:00 2001
From: Tanish Yelgoe <143334319+tanishy7777@users.noreply.github.com>
Date: Mon, 16 Dec 2024 22:33:28 +0530
Subject: [PATCH] Fix #4731 (#4837)

---
 package/MDAnalysis/lib/distances.py | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/package/MDAnalysis/lib/distances.py b/package/MDAnalysis/lib/distances.py
index 524b9f4063..2759a0ffb3 100644
--- a/package/MDAnalysis/lib/distances.py
+++ b/package/MDAnalysis/lib/distances.py
@@ -401,10 +401,9 @@ def self_distance_array(
 
             for i in range(n):
                 for j in range(i + 1, n):
+                    dist[i, j] = dist[j, i] = d[k]
                     k += 1
-                    dist[i, j] = d[k]
-
-
+                    
     .. versionchanged:: 0.13.0
        Added *backend* keyword.
     .. versionchanged:: 0.19.0