diff --git a/ChangeLog b/ChangeLog
index 9db0346793..d3445b65be 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -10,6 +10,12 @@
 	  (lone zb subtotals, spurious 'recursive-bal, typos)
 	  needed to make the new account-summary.scm work.
 
+	Thomas Bushnell's patch to protect non-backup pruning (#164875)
+	* src/backend/file/gnc-backend-file.c:
+	  When working on the file foo.xac, backups are named
+	  foo.DATE.xac.  But the backup file pruner will prune any old
+	  file named foo.DATE.anything.
+
 2005-01-29  Christian Stimming  <stimming@tuhh.de>
 
 	* configure.in, src/tax/us/gncmod-tax-us.c,
diff --git a/src/backend/file/gnc-backend-file.c b/src/backend/file/gnc-backend-file.c
index 3356cbf153..b1fecc539d 100644
--- a/src/backend/file/gnc-backend-file.c
+++ b/src/backend/file/gnc-backend-file.c
@@ -665,6 +665,7 @@ gnc_file_be_remove_old_files(FileBackend *be)
                 /* Make sure this file actually has a date before unlinking */
                 if (res && res != name+pathlen+1 &&
                     /* We consumed some but not all of the filename */
+		    !strcmp(res, ".xac") &&
                     file_time > 0 &&
                     /* we actually have a reasonable time and it is old enough */
                     days > file_retention_days)