diff --git a/intern/ghost/intern/GHOST_ImeWin32.hh b/intern/ghost/intern/GHOST_ImeWin32.hh
index 6d4793f3fe6..e63f3de7a96 100644
--- a/intern/ghost/intern/GHOST_ImeWin32.hh
+++ b/intern/ghost/intern/GHOST_ImeWin32.hh
@@ -30,7 +30,10 @@ class GHOST_EventIME : public GHOST_Event {
    * \param type: The type of key event.
    * \param key: The key code of the key.
    */
-  GHOST_EventIME(uint64_t msec, GHOST_TEventType type, GHOST_IWindow *window, void *customdata)
+  GHOST_EventIME(uint64_t msec,
+                 GHOST_TEventType type,
+                 GHOST_IWindow *window,
+                 const void *customdata)
       : GHOST_Event(msec, type, window)
   {
     this->m_data = customdata;
diff --git a/intern/ghost/intern/GHOST_SystemWayland.cc b/intern/ghost/intern/GHOST_SystemWayland.cc
index ba9e4229b84..814ee0ca1a4 100644
--- a/intern/ghost/intern/GHOST_SystemWayland.cc
+++ b/intern/ghost/intern/GHOST_SystemWayland.cc
@@ -5796,7 +5796,7 @@ class GHOST_EventIME : public GHOST_Event {
   GHOST_EventIME(uint64_t msec,
                  GHOST_TEventType type,
                  GHOST_IWindow *window,
-                 GHOST_TEventImeData *customdata)
+                 const GHOST_TEventImeData *customdata)
       : GHOST_Event(msec, type, window)
   {
     /* Make sure that we keep a copy of the IME input. Otherwise it might get lost
diff --git a/intern/ghost/intern/GHOST_SystemWin32.cc b/intern/ghost/intern/GHOST_SystemWin32.cc
index 7c4602b600f..7055a406deb 100644
--- a/intern/ghost/intern/GHOST_SystemWin32.cc
+++ b/intern/ghost/intern/GHOST_SystemWin32.cc
@@ -1409,7 +1409,7 @@ GHOST_Event *GHOST_SystemWin32::processWindowEvent(GHOST_TEventType type,
 #ifdef WITH_INPUT_IME
 GHOST_Event *GHOST_SystemWin32::processImeEvent(GHOST_TEventType type,
                                                 GHOST_WindowWin32 *window,
-                                                GHOST_TEventImeData *data)
+                                                const GHOST_TEventImeData *data)
 {
   GHOST_SystemWin32 *system = (GHOST_SystemWin32 *)getSystem();
   return new GHOST_EventIME(getMessageTime(system), type, window, data);
diff --git a/intern/ghost/intern/GHOST_SystemWin32.hh b/intern/ghost/intern/GHOST_SystemWin32.hh
index 1845f89daaa..abb91d67de2 100644
--- a/intern/ghost/intern/GHOST_SystemWin32.hh
+++ b/intern/ghost/intern/GHOST_SystemWin32.hh
@@ -426,7 +426,7 @@ class GHOST_SystemWin32 : public GHOST_System {
    */
   static GHOST_Event *processImeEvent(GHOST_TEventType type,
                                       GHOST_WindowWin32 *window,
-                                      GHOST_TEventImeData *data);
+                                      const GHOST_TEventImeData *data);
 #endif /* WITH_INPUT_IME */
 
   /**
diff --git a/intern/ghost/intern/GHOST_WindowCocoa.hh b/intern/ghost/intern/GHOST_WindowCocoa.hh
index 12e6151ef43..9abee529e56 100644
--- a/intern/ghost/intern/GHOST_WindowCocoa.hh
+++ b/intern/ghost/intern/GHOST_WindowCocoa.hh
@@ -321,7 +321,10 @@ class GHOST_EventIME : public GHOST_Event {
    * \param type: The type of key event.
    * \param key: The key code of the key.
    */
-  GHOST_EventIME(uint64_t msec, GHOST_TEventType type, GHOST_IWindow *window, void *customdata)
+  GHOST_EventIME(uint64_t msec,
+                 GHOST_TEventType type,
+                 GHOST_IWindow *window,
+                 const void *customdata)
       : GHOST_Event(msec, type, window)
   {
     this->m_data = customdata;