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-rw-r--r--src/mame/machine/sgi.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/machine/sgi.cpp b/src/mame/machine/sgi.cpp
index b978fc1f3df..f1fe3f20a21 100644
--- a/src/mame/machine/sgi.cpp
+++ b/src/mame/machine/sgi.cpp
@@ -84,7 +84,7 @@ void sgi_mc_device::device_resolve_objects()
void sgi_mc_device::device_start()
{
m_sys_id = 0x03; // rev. C MC
- m_sys_id = m_eisa_present() << 4;
+ m_sys_id |= m_eisa_present() << 4;
m_rpss_timer = timer_alloc(TIMER_RPSS);
m_rpss_timer->adjust(attotime::never);