diff --git a/base/changes.txt b/base/changes.txt
index c381e020f..46cb06bee 100644
--- a/base/changes.txt
+++ b/base/changes.txt
@@ -6,6 +6,10 @@ to completeness or accuracy and it contains some references to files that are
 not part of the distribution.
 ================================================================================
 
+2024-12-03  Yukai Chou  <muzimuzhi@gmail.com>
+	* ltmarks.dtx (subsection{Allocating new mark classes}):
+	Fix inconsistent local/global assignment (gh/1574)
+
 2024-11-27  Frank Mittelbach  <Frank.Mittelbach@latex-project.org>
 
 	* ltfssdcl.dtx (section{Interface Commands}):
diff --git a/base/ltmarks.dtx b/base/ltmarks.dtx
index 1e1c5c7fb..3e73a708f 100644
--- a/base/ltmarks.dtx
+++ b/base/ltmarks.dtx
@@ -17,7 +17,7 @@
 %<*driver>
 % \fi
 \ProvidesFile{ltmarks.dtx}
-             [2024/11/14 v1.1a LaTeX Kernel (Marks)]
+             [2024/12/03 v1.1b LaTeX Kernel (Marks)]
 % \iffalse
 %
 \documentclass{l3doc}
@@ -979,7 +979,8 @@
 %
 %
 %  \begin{macro}{\@@_init_region:nn,\c_@@_empty_tl}
-%    
+% \changes{v1.1b}{2024/12/03}{Fix inconsistent local/global assignment (gh/1574)}
+%
 %    For each class (\texttt{\#2}) and region (\texttt{\#1}), we need
 %    three token lists: one for top, first, and last. The default value to be
 %    returned is \enquote{empty}.
@@ -988,12 +989,12 @@
   \tl_new:c { g_@@_#1_top_   #2 _tl }
   \tl_new:c { g_@@_#1_first_ #2 _tl }
   \tl_new:c { g_@@_#1_last_  #2 _tl }
-  \tl_set_eq:cN  { g_@@_#1_top_   #2 _tl } \c_@@_empty_tl
-  \tl_set_eq:cN  { g_@@_#1_first_ #2 _tl } \c_@@_empty_tl
-  \tl_set_eq:cN  { g_@@_#1_last_  #2 _tl } \c_@@_empty_tl
+  \tl_gset_eq:cN  { g_@@_#1_top_   #2 _tl } \c_@@_empty_tl
+  \tl_gset_eq:cN  { g_@@_#1_first_ #2 _tl } \c_@@_empty_tl
+  \tl_gset_eq:cN  { g_@@_#1_last_  #2 _tl } \c_@@_empty_tl
 }
 %    \end{macrocode}
-%    
+%
 %    All marks will have an identification in the form of a
 %    number\footnote{There are a few cases where special
 %    identification strings are used, e.g., \texttt{2.09-compat}.} that is
diff --git a/base/testfiles-ltmarks/xmarks-001.lvt b/base/testfiles-ltmarks/xmarks-001.lvt
index 9a8f38fd7..2b30ab2e3 100644
--- a/base/testfiles-ltmarks/xmarks-001.lvt
+++ b/base/testfiles-ltmarks/xmarks-001.lvt
@@ -7,6 +7,9 @@
 \pagestyle{headings}
 
 \input{regression-test}
+\ExplSyntaxOn
+\debug_on:n { check-declarations, deprecation }
+\ExplSyntaxOff
 
 \DebugMarksOn