diff --git a/ArduPlane/Parameters.cpp b/ArduPlane/Parameters.cpp
index 8d77c5ebbe..f222584183 100644
--- a/ArduPlane/Parameters.cpp
+++ b/ArduPlane/Parameters.cpp
@@ -8,10 +8,10 @@
  */
 
 #define GSCALAR(v, name, def) { plane.g.v.vtype, name, Parameters::k_param_ ## v, &plane.g.v, {def_value : def} }
-#define ASCALAR(v, name, def) { plane.aparm.v.vtype, name, Parameters::k_param_ ## v, &plane.aparm.v, {def_value : def} }
+#define ASCALAR(v, name, def) { plane.aparm.v.vtype, name, Parameters::k_param_ ## v, (const void *)&plane.aparm.v, {def_value : def} }
 #define GGROUP(v, name, class) { AP_PARAM_GROUP, name, Parameters::k_param_ ## v, &plane.g.v, {group_info : class::var_info} }
-#define GOBJECT(v, name, class) { AP_PARAM_GROUP, name, Parameters::k_param_ ## v, &plane.v, {group_info : class::var_info} }
-#define GOBJECTN(v, pname, name, class) { AP_PARAM_GROUP, name, Parameters::k_param_ ## pname, &plane.v, {group_info : class::var_info} }
+#define GOBJECT(v, name, class) { AP_PARAM_GROUP, name, Parameters::k_param_ ## v, (const void *)&plane.v, {group_info : class::var_info} }
+#define GOBJECTN(v, pname, name, class) { AP_PARAM_GROUP, name, Parameters::k_param_ ## pname, (const void *)&plane.v, {group_info : class::var_info} }
 
 const AP_Param::Info Plane::var_info[] PROGMEM = {
     // @Param: FORMAT_VERSION
@@ -1164,12 +1164,6 @@ const AP_Param::Info Plane::var_info[] PROGMEM = {
     GOBJECT(obc,  "AFS_", APM_OBC),
 #endif
 
-#if AP_AHRS_NAVEKF_AVAILABLE
-    // @Group: EKF_
-    // @Path: ../libraries/AP_NavEKF/AP_NavEKF.cpp
-    GOBJECTN(ahrs.get_NavEKF(), NavEKF, "EKF_", NavEKF),
-#endif
-
 #if OPTFLOW == ENABLED
     // @Group: FLOW
     // @Path: ../libraries/AP_OpticalFlow/OpticalFlow.cpp
@@ -1184,6 +1178,12 @@ const AP_Param::Info Plane::var_info[] PROGMEM = {
     // @Path: ../libraries/AP_Rally/AP_Rally.cpp
     GOBJECT(rally,  "RALLY_",       AP_Rally),
 
+#if AP_AHRS_NAVEKF_AVAILABLE
+    // @Group: EKF_
+    // @Path: ../libraries/AP_NavEKF/AP_NavEKF.cpp
+    GOBJECTN(ahrs.get_NavEKF_const(), NavEKF, "EKF_", NavEKF),
+#endif
+
     AP_VAREND
 };