diff --git a/conf/airframes/booz2_flixr.xml b/conf/airframes/booz2_flixr.xml
index e831bc675a..232a49dbb7 100644
--- a/conf/airframes/booz2_flixr.xml
+++ b/conf/airframes/booz2_flixr.xml
@@ -37,7 +37,9 @@
     <load name="booz_drop.xml"/>
     <load name="sys_mon.xml"/>
     <!--load name="booz_cam.xml"/-->
-    <!--load name="sonar_maxbotix_booz.xml"/-->
+    <load name="sonar_maxbotix_booz.xml">
+      <configure name="ADC_SONAR" value="ADC_0"/>
+    </load>
   </modules>
 
   <commands>
@@ -185,7 +187,8 @@
   </section>
 
   <section name="INS" prefix="INS_">
-    <define name="BARO_SENS" value="15." integer="16" />
+    <define name="BARO_SENS" value="15." integer="16"/>
+    <define name="SONAR_SENS" value="2.146" integer="16"/>
   </section>
 
   <section name="GUIDANCE_V" prefix="GUIDANCE_V_">
diff --git a/conf/modules/demo_module.xml b/conf/modules/demo_module.xml
index 7fd7e31464..cb03682051 100644
--- a/conf/modules/demo_module.xml
+++ b/conf/modules/demo_module.xml
@@ -9,7 +9,7 @@
   <periodic fun="periodic_10Hz_demo()" period="0.1" start="start_demo()" stop="stop_demo()" autorun="FALSE"/>
   <makefile>
     <raw>
-#Exemple of RAW makefile part
+#Example of RAW makefile part
     </raw>
     <define name="DEMO_MODULE_LED" value="2"/>
     <file name="demo_module.c"/>
diff --git a/conf/modules/sonar_maxbotix_booz.xml b/conf/modules/sonar_maxbotix_booz.xml
index e28a1aa754..41607ccd1a 100644
--- a/conf/modules/sonar_maxbotix_booz.xml
+++ b/conf/modules/sonar_maxbotix_booz.xml
@@ -19,6 +19,12 @@
     <file name="sonar_maxbotix.c"/>
   </makefile>
   <makefile target="ap">
+    <raw>
+# set ADC_SONAR to ADC_0 as default
+ifeq ($(ADC_SONAR),)
+ADC_SONAR = ADC_0
+endif
+    </raw>
     <define name="ADC_CHANNEL_SONAR" value="$(ADC_SONAR)"/>
     <define name="USE_$(ADC_SONAR)"/>
     <define name="USE_SONAR"/>