diff --git a/src/mame/drivers/namcos21.cpp b/src/mame/drivers/namcos21.cpp
index 983af62a30b..a596473c40f 100644
--- a/src/mame/drivers/namcos21.cpp
+++ b/src/mame/drivers/namcos21.cpp
@@ -2681,7 +2681,7 @@ static INPUT_PORTS_START( aircomb )
 	PORT_MODIFY("AN2")      /* IN#4: 63B05Z0 - 8 CHANNEL ANALOG - CHANNEL 2 */
 	PORT_BIT( 0xff, 0x80, IPT_AD_STICK_Y ) PORT_MINMAX(0x00,0xff) PORT_SENSITIVITY(100) PORT_KEYDELTA(4)
 	PORT_MODIFY("AN3")      /* IN#5: 63B05Z0 - 8 CHANNEL ANALOG - CHANNEL 3 */
-	PORT_BIT( 0xff, 0x80, IPT_AD_STICK_Z ) PORT_MINMAX(0x00,0xff) PORT_SENSITIVITY(100) PORT_KEYDELTA(4)
+	PORT_BIT( 0xff, 0x80, IPT_AD_STICK_Z ) PORT_MINMAX(0x00,0xff) PORT_SENSITIVITY(100) PORT_KEYDELTA(4) PORT_REVERSE
 	PORT_MODIFY("AN4")      /* IN#6: 63B05Z0 - 8 CHANNEL ANALOG - CHANNEL 4 */
 	PORT_BIT( 0xff, IP_ACTIVE_LOW, IPT_UNUSED )
 	PORT_MODIFY("AN5")      /* IN#7: 63B05Z0 - 8 CHANNEL ANALOG - CHANNEL 5 */