diff --git a/src/mame/machine/namco06.cpp b/src/mame/machine/namco06.cpp
index fe3eb02c7a2..2ed9d3aea29 100644
--- a/src/mame/machine/namco06.cpp
+++ b/src/mame/machine/namco06.cpp
@@ -207,8 +207,7 @@ void namco_06xx_device::ctrl_w(uint8_t data)
 		uint8_t num_shifts = (m_control & 0xe0) >> 5;
 		uint8_t divisor = 1 << num_shifts;
 		// The next change happens on the next clock falling edge.
-		// Approximate this by waiting half a clock.
-		m_nmi_timer->adjust(attotime::from_ticks(.5, clock()), 0, attotime::from_hz(clock() / divisor) / 2);
+		m_nmi_timer->adjust(attotime::from_ticks(0, clock()), 0, attotime::from_hz(clock() / divisor) / 2);
 	}
 }