diff --git a/libraries/AP_GPS/AP_GPS.cpp b/libraries/AP_GPS/AP_GPS.cpp
index cbd93776ff..6b2c24e63c 100644
--- a/libraries/AP_GPS/AP_GPS.cpp
+++ b/libraries/AP_GPS/AP_GPS.cpp
@@ -624,6 +624,7 @@ void AP_GPS::update_instance(uint8_t instance)
             delete drivers[instance];
             drivers[instance] = nullptr;
             memset(&state[instance], 0, sizeof(state[instance]));
+            state[instance].instance = instance;
             state[instance].status = NO_GPS;
             state[instance].hdop = GPS_UNKNOWN_DOP;
             state[instance].vdop = GPS_UNKNOWN_DOP;