diff --git a/src/mame/drivers/atarisy1.cpp b/src/mame/drivers/atarisy1.cpp
index 3ad06d3c230..3a866a84516 100644
--- a/src/mame/drivers/atarisy1.cpp
+++ b/src/mame/drivers/atarisy1.cpp
@@ -625,7 +625,7 @@ INPUT_PORTS_END
 
 static INPUT_PORTS_START( roadblst )
 	PORT_START("IN0")   // F20000
-	PORT_BIT( 0xff, 0x00, IPT_DIAL ) PORT_SENSITIVITY(25) PORT_KEYDELTA(10) PORT_REVERSE
+	PORT_BIT( 0x7f, 0x00, IPT_AD_STICK_X ) PORT_SENSITIVITY(50) PORT_KEYDELTA(5) PORT_REVERSE
 
 	PORT_START("IN1")   // F40000
 	PORT_BIT( 0xff, 0x00, IPT_PEDAL ) PORT_SENSITIVITY(100) PORT_KEYDELTA(64)