diff --git a/launch/rpa_positioning_sensors.launch b/launch/rpa_positioning_sensors.launch
index 8517512abbed3f7f1eae57195cb482e3d121d0c7..eb6c662c28935b6efb49a58dc5bef9871c152775 100644
--- a/launch/rpa_positioning_sensors.launch
+++ b/launch/rpa_positioning_sensors.launch
@@ -5,7 +5,7 @@
     <arg name="record_output"  default="true" />
     <arg name="record_sensors" default="true" />
     
-    <arg name="platform"  default="$(env HOSTNAME)" /><!-- tucan, M600a, atlantic -->
+    <arg name="platform"  default="$(optenv HOSTNAME tucan)" /><!-- tucan, M600a, atlantic -->
     <arg name="only_gnss" default="false" />
     
     <arg name="mqtt" default="false" if="$(eval platform == 'tucan')"/>