diff --git a/Tools/gazebo_sitl_multiple_run.sh b/Tools/gazebo_sitl_multiple_run.sh
index 22761febc3..6c6b638175 100755
--- a/Tools/gazebo_sitl_multiple_run.sh
+++ b/Tools/gazebo_sitl_multiple_run.sh
@@ -126,6 +126,7 @@ else
 
 		m=0
 		while [ $m -lt ${target_number} ]; do
+			export PX4_SIM_MODEL=${target_vehicle}${LABEL}
 			spawn_model ${target_vehicle} $n $target_x $target_y
 			m=$(($m + 1))
 			n=$(($n + 1))