diff --git a/libraries/SITL/examples/EvaluateBatteryModel/wscript b/libraries/SITL/examples/EvaluateBatteryModel/wscript
index 051d4b20402ba..2b0d8f334be6c 100644
--- a/libraries/SITL/examples/EvaluateBatteryModel/wscript
+++ b/libraries/SITL/examples/EvaluateBatteryModel/wscript
@@ -9,9 +9,8 @@ def build(bld):
     source = bld.path.ant_glob('*.cpp')
     source.append('../../../../libraries/SITL/SIM_Battery.cpp')
     source.append('../../../../libraries/SITL/SIM_Frame.cpp')
-    source.append('../../../../libraries/SITL/picojson.cpp')
 
-    bld.env.DEFINES.append("USE_PICOJSON=1")
+    bld.env.DEFINES.append("AP_JSONPARSER_ENABLED")
 
     bld.ap_program(
         use='ap',
diff --git a/libraries/SITL/examples/EvaluateMotorModel/wscript b/libraries/SITL/examples/EvaluateMotorModel/wscript
index 0caacfec4de8f..cf3926cae2961 100644
--- a/libraries/SITL/examples/EvaluateMotorModel/wscript
+++ b/libraries/SITL/examples/EvaluateMotorModel/wscript
@@ -9,9 +9,8 @@ def build(bld):
     source = bld.path.ant_glob('*.cpp')
     source.append('../../../../libraries/SITL/SIM_Motor.cpp')
     source.append('../../../../libraries/SITL/SIM_Frame.cpp')
-    source.append('../../../../libraries/SITL/picojson.cpp')
 
-    bld.env.DEFINES.append("USE_PICOJSON=1")
+    bld.env.DEFINES.append("AP_JSONPARSER_ENABLED")
 
     bld.ap_program(
         use='ap',