diff --git a/Blimp/GCS_Mavlink.cpp b/Blimp/GCS_Mavlink.cpp
index dd516e3e92163..8eaf6473dd973 100644
--- a/Blimp/GCS_Mavlink.cpp
+++ b/Blimp/GCS_Mavlink.cpp
@@ -344,7 +344,9 @@ static const ap_message STREAM_RC_CHANNELS_msgs[] = {
 };
 static const ap_message STREAM_EXTRA1_msgs[] = {
     MSG_ATTITUDE,
+#if AP_SIM_ENABLED
     MSG_SIMSTATE,
+#endif
     MSG_AHRS2,
     MSG_PID_TUNING // Up to four PID_TUNING messages are sent, depending on GCS_PID_MASK parameter
 };