diff --git a/base/applications/kbswitch/kbswitch.h b/base/applications/kbswitch/kbswitch.h
index 91906a08e6b..79ea09f7e0e 100644
--- a/base/applications/kbswitch/kbswitch.h
+++ b/base/applications/kbswitch/kbswitch.h
@@ -10,6 +10,7 @@
 #include <shellapi.h>
 #include <tchar.h>
 #include <strsafe.h>
+#include <ime/indicml.h> /* INDICATOR_CLASS, INDICM_... */
 
 #include "resource.h"
 
@@ -26,4 +27,4 @@
 typedef BOOL (WINAPI *PKBSWITCHSETHOOKS) (VOID);
 typedef VOID (WINAPI *PKBSWITCHDELETEHOOKS) (VOID);
 
-TCHAR szKbSwitcherName[] = _T("kbswitcher");
+const TCHAR szKbSwitcherName[] = INDICATOR_CLASS;
diff --git a/sdk/include/ime/indicml.h b/sdk/include/ime/indicml.h
new file mode 100644
index 00000000000..f4660d2c94d
--- /dev/null
+++ b/sdk/include/ime/indicml.h
@@ -0,0 +1,30 @@
+/*
+ * PROJECT:     ReactOS headers
+ * LICENSE:     LGPL-2.0-or-later (https://spdx.org/licenses/LGPL-2.0-or-later)
+ * PURPOSE:     Indicator (internat.exe) window class
+ * COPYRIGHT:   Copyright 2025 Katayama Hirofumi MZ (katayama.hirofumi.mz@gmail.com)
+ */
+
+#ifndef _INDICML_
+#define _INDICML_
+
+#pragma once
+
+#define INDICATOR_CLASSW L"Indicator"
+#define INDICATOR_CLASSA  "Indicator"
+
+#ifdef UNICODE
+#define INDICATOR_CLASS INDICATOR_CLASSW
+#else
+#define INDICATOR_CLASS INDICATOR_CLASSA
+#endif
+
+#define INDICM_SETIMEICON              (WM_USER + 100)
+#define INDICM_SETIMETOOLTIPS          (WM_USER + 101)
+#define INDICM_REMOVEDEFAULTMENUITEMS  (WM_USER + 102)
+
+/* wParam flags for INDICM_REMOVEDEFAULTMENUITEMS */
+#define RDMI_LEFT  1
+#define RDMI_RIGHT 2
+
+#endif /* ndef _INDICML_ */