diff --git a/conf/airframes/ardrone2_raw.xml b/conf/airframes/ardrone2_raw.xml
index 2f253fe981..2546c48c7a 100644
--- a/conf/airframes/ardrone2_raw.xml
+++ b/conf/airframes/ardrone2_raw.xml
@@ -108,7 +108,6 @@
   <section name="INS" prefix="INS_">
     <define name="SONAR_MAX_RANGE" value="2.2"/>
     <define name="SONAR_UPDATE_ON_AGL" value="TRUE"/>
-    <define name="SONAR_VARIANCE_THRESHOLD" VALUE="2.0"/>
   </section>
 
   <section name="STABILIZATION_RATE" prefix="STABILIZATION_RATE_">