diff --git a/Tools/ardupilotwaf/boards.py b/Tools/ardupilotwaf/boards.py
index d785c6161b..2c9432d85e 100644
--- a/Tools/ardupilotwaf/boards.py
+++ b/Tools/ardupilotwaf/boards.py
@@ -849,6 +849,7 @@ class sitl_periph_gps(sitl):
             HAL_PERIPH_ENABLE_RPM = 1,
             HAL_PERIPH_ENABLE_RC_OUT = 1,
             HAL_PERIPH_ENABLE_ADSB = 1,
+            HAL_PERIPH_ENABLE_SERIAL_OPTIONS = 1,
             AP_ICENGINE_ENABLED = 0,
             AP_AIRSPEED_ENABLED = 1,
             AP_AIRSPEED_AUTOCAL_ENABLE = 0,