diff --git a/apps/emqx_utils/src/emqx_utils.app.src b/apps/emqx_utils/src/emqx_utils.app.src
index 9e2f77d71..3dffe8cec 100644
--- a/apps/emqx_utils/src/emqx_utils.app.src
+++ b/apps/emqx_utils/src/emqx_utils.app.src
@@ -2,7 +2,7 @@
 {application, emqx_utils, [
     {description, "Miscellaneous utilities for EMQX apps"},
     % strict semver, bump manually!
-    {vsn, "5.1.0"},
+    {vsn, "5.1.1"},
     {modules, [
         emqx_utils,
         emqx_utils_api,
diff --git a/apps/emqx_utils/src/emqx_utils.erl b/apps/emqx_utils/src/emqx_utils.erl
index 0be489696..aa6b7d2cf 100644
--- a/apps/emqx_utils/src/emqx_utils.erl
+++ b/apps/emqx_utils/src/emqx_utils.erl
@@ -261,7 +261,7 @@ check_oom(Pid, #{
             ok;
         [{message_queue_len, QLen}, {total_heap_size, HeapSize}] ->
             do_check_oom([
-                {QLen, MaxQLen, message_queue_too_long},
+                {QLen, MaxQLen, mailbox_overflow},
                 {HeapSize, MaxHeapSize, proc_heap_too_large}
             ])
     end.
diff --git a/apps/emqx_utils/test/emqx_utils_SUITE.erl b/apps/emqx_utils/test/emqx_utils_SUITE.erl
index c3a8cc17f..acb2623de 100644
--- a/apps/emqx_utils/test/emqx_utils_SUITE.erl
+++ b/apps/emqx_utils/test/emqx_utils_SUITE.erl
@@ -150,7 +150,7 @@ t_check(_) ->
     ?assertEqual(ok, emqx_utils:check_oom(Policy)),
     [self() ! {msg, I} || I <- lists:seq(1, 6)],
     ?assertEqual(
-        {shutdown, #{reason => message_queue_too_long, value => 11, max => 10}},
+        {shutdown, #{reason => mailbox_overflow, value => 11, max => 10}},
         emqx_utils:check_oom(Policy)
     ).
 
diff --git a/changes/ce/fix-12766.en.md b/changes/ce/fix-12766.en.md
new file mode 100644
index 000000000..51ace3faf
--- /dev/null
+++ b/changes/ce/fix-12766.en.md
@@ -0,0 +1,3 @@
+Rename `message_queue_too_long` error reason to `mailbox_overflow`
+
+`mailbox_overflow` is consistent with the corresponding config parameter: `force_shutdown.max_mailbox_size`.