diff --git a/src/drivers/ist8310/ist8310.cpp b/src/drivers/ist8310/ist8310.cpp
index c2693d1b16..3fecc7b3bf 100644
--- a/src/drivers/ist8310/ist8310.cpp
+++ b/src/drivers/ist8310/ist8310.cpp
@@ -175,8 +175,11 @@ static const int16_t IST8310_MIN_VAL_Z  = -IST8310_MAX_VAL_Z;
 
 enum IST8310_BUS {
 	IST8310_BUS_ALL           = 0,
-	IST8310_BUS_I2C_EXTERNAL = 1,
-	IST8310_BUS_I2C_INTERNAL = 2,
+	IST8310_BUS_I2C_EXTERNAL  = 1,
+	IST8310_BUS_I2C_EXTERNAL1 = 2,
+	IST8310_BUS_I2C_EXTERNAL2 = 3,
+	IST8310_BUS_I2C_EXTERNAL3 = 4,
+	IST8310_BUS_I2C_INTERNAL  = 5,
 };
 
 #ifndef CONFIG_SCHED_WORKQUEUE
@@ -1277,6 +1280,15 @@ struct ist8310_bus_option {
 	IST8310 *dev;
 } bus_options[] = {
 	{ IST8310_BUS_I2C_EXTERNAL, "/dev/ist8310_ext", PX4_I2C_BUS_EXPANSION, NULL },
+#ifdef PX4_I2C_BUS_EXPANSION1
+	{ IST8310_BUS_I2C_EXTERNAL1, "/dev/ist8311_int", PX4_I2C_BUS_EXPANSION1, NULL },
+#endif
+#ifdef PX4_I2C_BUS_EXPANSION2
+	{ IST8310_BUS_I2C_EXTERNAL2, "/dev/ist8312_int", PX4_I2C_BUS_EXPANSION2, NULL },
+#endif
+#ifdef PX4_I2C_BUS_EXPANSION3
+	{ IST8310_BUS_I2C_EXTERNAL3, "/dev/ist8313_int", PX4_I2C_BUS_EXPANSION3, NULL },
+#endif
 #ifdef PX4_I2C_BUS_ONBOARD
 	{ IST8310_BUS_I2C_INTERNAL, "/dev/ist8310_int", PX4_I2C_BUS_ONBOARD, NULL },
 #endif
@@ -1548,7 +1560,7 @@ usage()
 	PX4_INFO("    -R rotation");
 	PX4_INFO("    -C calibrate on start");
 	PX4_INFO("    -a 12C Address (0x%02x)", IST8310_BUS_I2C_ADDR);
-	PX4_INFO("    -b 12C bus (%d|%d)", IST8310_BUS_I2C_EXTERNAL, IST8310_BUS_I2C_INTERNAL);
+	PX4_INFO("    -b 12C bus (%d-%d)", IST8310_BUS_I2C_EXTERNAL, IST8310_BUS_I2C_INTERNAL);
 }
 
 } // namespace