diff --git a/src/mame/drivers/multigam.c b/src/mame/drivers/multigam.c
index b39edc22a6e..7d0079d916c 100644
--- a/src/mame/drivers/multigam.c
+++ b/src/mame/drivers/multigam.c
@@ -454,7 +454,7 @@ void multigam_state::multigam3_mmc3_scanline_cb( int scanline, int vblank, int b
 		if (--m_multigam3_mmc3_scanline_counter == -1)
 		{
 			m_multigam3_mmc3_scanline_counter = m_multigam3_mmc3_scanline_latch;
-			generic_pulse_irq_line(m_maincpu, 0, 1);
+			machine().device("maincpu")->execute().set_input_line(M6502_IRQ_LINE, ASSERT_LINE);
 		}
 	}
 }
@@ -598,6 +598,7 @@ WRITE8_MEMBER(multigam_state::multigam3_mmc3_rom_switch_w)
 		break;
 
 		case 0x6000: /* disable irqs */
+			machine().device("maincpu")->execute().set_input_line(M6502_IRQ_LINE, CLEAR_LINE);
 			ppu->set_scanline_callback(ppu2c0x_scanline_delegate());
 		break;