diff --git a/conf/airframes/CDW/DualBoardApFbw.xml b/conf/airframes/CDW/DualBoardApFbw.xml
index bd93c11697..f8ce165138 100644
--- a/conf/airframes/CDW/DualBoardApFbw.xml
+++ b/conf/airframes/CDW/DualBoardApFbw.xml
@@ -229,8 +229,7 @@
   <firmware name="fixedwing">
 
     <target name="ap" board="lisa_m_2.0">
-      <!-- this define is not available in paparazzi v4.1 -->
-      <!--define name="LISA_M_LONGITUDINAL_X"/-->
+      <define name="LISA_M_LONGITUDINAL_X"/>
 
       <configure name="SEPARATE_FBW" value="1"/>
 
diff --git a/conf/airframes/esden/hexy_lm2a2pwm.xml b/conf/airframes/esden/hexy_lm2a2pwm.xml
index 6fea357f2b..00cf6e1bcc 100644
--- a/conf/airframes/esden/hexy_lm2a2pwm.xml
+++ b/conf/airframes/esden/hexy_lm2a2pwm.xml
@@ -199,6 +199,7 @@
 
     <subsystem name="telemetry"     type="transparent"/>
     <subsystem name="imu"           type="aspirin_v2.1"/>
+    <define name="LISA_M_LONGITUDINAL_X"/>
     <subsystem name="gps"           type="ublox"/>
     <subsystem name="stabilization" type="int_quat"/>
     <subsystem name="ahrs"          type="int_cmpl_quat"/>
diff --git a/conf/airframes/examples/MentorEnergy.xml b/conf/airframes/examples/MentorEnergy.xml
index 4245535aaa..ad57bc466c 100644
--- a/conf/airframes/examples/MentorEnergy.xml
+++ b/conf/airframes/examples/MentorEnergy.xml
@@ -7,7 +7,8 @@
 <airframe name="LisaAspirin2">
 
   <firmware name="fixedwing">
-    <target name="ap" board="lisa_m_2.0">
+    <target name="ap" board="lisa_m_1.0">
+      <define name="LISA_M_LONGITUDINAL_X"/>
       <define name="SENSOR_SYNC_SEND"/>
 
       <configure name="PERIODIC_FREQUENCY" value="120"/>
diff --git a/conf/airframes/examples/separate_fbw_ap.xml b/conf/airframes/examples/separate_fbw_ap.xml
index e08dbfc0d4..352e060f7c 100644
--- a/conf/airframes/examples/separate_fbw_ap.xml
+++ b/conf/airframes/examples/separate_fbw_ap.xml
@@ -254,6 +254,8 @@
   <firmware name="fixedwing">
 
     <target name="ap" board="lisa_m_2.0">
+      <define name="LISA_M_LONGITUDINAL_X"/>
+
       <configure name="SEPARATE_FBW" value="1"/>
 
       <configure name="PERIODIC_FREQUENCY" value="120"/>