diff --git a/src/mame/audio/cage.cpp b/src/mame/audio/cage.cpp
index 6d8df51bbcb..e0c9e9fae37 100644
--- a/src/mame/audio/cage.cpp
+++ b/src/mame/audio/cage.cpp
@@ -163,6 +163,7 @@ void atari_cage_device::device_start()
 	save_item(NAME(m_timer_enabled));
 	save_item(NAME(m_from_main));
 	save_item(NAME(m_control));
+	save_item(NAME(m_tms32031_io_regs));
 }