diff --git a/src/game_mouse.cc b/src/game_mouse.cc
index 9f82fcd..fca7c79 100644
--- a/src/game_mouse.cc
+++ b/src/game_mouse.cc
@@ -1328,6 +1328,12 @@ int gameMouseGetCursor()
     return gGameMouseCursor;
 }
 
+// 0x44C9F0
+void gmouse_set_mapper_mode(int mode)
+{
+    _gmouse_mapper_mode = mode;
+}
+
 // 0x44C9F8
 void _gmouse_3d_enable_modes()
 {
diff --git a/src/game_mouse.h b/src/game_mouse.h
index fc65633..2b99efe 100644
--- a/src/game_mouse.h
+++ b/src/game_mouse.h
@@ -86,6 +86,7 @@ void gameMouseRefresh();
 void _gmouse_handle_event(int mouseX, int mouseY, int mouseState);
 int gameMouseSetCursor(int cursor);
 int gameMouseGetCursor();
+void gmouse_set_mapper_mode(int mode);
 void gameMouseSetMode(int a1);
 int gameMouseGetMode();
 void gameMouseCycleMode();