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-rw-r--r--src/emu/memory.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/emu/memory.c b/src/emu/memory.c
index 9ec532ad8d3..63001ec757c 100644
--- a/src/emu/memory.c
+++ b/src/emu/memory.c
@@ -4398,7 +4398,7 @@ void handler_entry::configure_subunits(UINT64 handlermask, int handlerbits, int
// compute the inverse mask
m_invsubmask = 0;
for (int i = 0; i < m_subunits; i++)
- m_invsubmask |= m_subunit_infos[i].m_mask << m_subunit_infos[i].m_shift;
+ m_invsubmask |= UINT64(m_subunit_infos[i].m_mask) << m_subunit_infos[i].m_shift;
m_invsubmask = ~m_invsubmask;
}