-#define MOUSE_IN_EPNUM 2
-#define CONSOLE_IN_EPNUM 3
-#define CONSOLE_OUT_EPNUM 4
-#define EXTRA_IN_EPNUM 5
+
+#ifdef MOUSE_ENABLE
+# define MOUSE_IN_EPNUM (KEYBOARD_IN_EPNUM + 1)
+#else
+# define MOUSE_IN_EPNUM KEYBOARD_IN_EPNUM
+#endif
+
+#ifdef EXTRAKEY_ENABLE
+# define EXTRAKEY_IN_EPNUM (MOUSE_IN_EPNUM + 1)
+#else
+# define EXTRAKEY_IN_EPNUM MOUSE_IN_EPNUM
+#endif
+
+#ifdef CONSOLE_ENABLE
+# define CONSOLE_IN_EPNUM (EXTRAKEY_IN_EPNUM + 1)
+# define CONSOLE_OUT_EPNUM (EXTRAKEY_IN_EPNUM + 2)
+#endif
+