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-rw-r--r--src/mame/machine/snes.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/mame/machine/snes.cpp b/src/mame/machine/snes.cpp
index 4adf17220b8..a0f4281ef4d 100644
--- a/src/mame/machine/snes.cpp
+++ b/src/mame/machine/snes.cpp
@@ -228,7 +228,7 @@ TIMER_CALLBACK_MEMBER(snes_state::snes_hblank_tick)
hdma(cpu0space);
if (m_screen->vpos() > 0)
- m_screen->update_partial((m_ppu->interlace() == 2) ? (m_ppu->current_vert() * m_ppu->interlace()) : m_ppu->current_vert());
+ m_screen->update_partial((m_ppu->interlace() == 2) ? (m_ppu->current_vert() * m_ppu->interlace()) : m_ppu->current_vert() - 1);
}
// signal hblank