diff --git a/Tools/AP_Periph/AP_Periph.h b/Tools/AP_Periph/AP_Periph.h
index a061e327406051..d47c8617debb5b 100644
--- a/Tools/AP_Periph/AP_Periph.h
+++ b/Tools/AP_Periph/AP_Periph.h
@@ -475,10 +475,10 @@ class AP_Periph_FW {
 
 #if AP_SIM_ENABLED
     SITL::SIM sitl;
+#endif
 #if AP_AHRS_ENABLED
     AP_AHRS ahrs;
 #endif
-#endif
 };
 
 #ifndef CAN_APP_NODE_NAME