diff --git a/src/FDM/JSBSim/JSBSim.cxx b/src/FDM/JSBSim/JSBSim.cxx
index 80ee3ee03..53a73e782 100644
--- a/src/FDM/JSBSim/JSBSim.cxx
+++ b/src/FDM/JSBSim/JSBSim.cxx
@@ -886,7 +886,7 @@ bool FGJSBsim::ToggleDataLogging(bool state)
 //Positions
 void FGJSBsim::set_Latitude(double lat)
 {
-    static const SGPropertyNode *altitude = fgGetNode("/position/altitude-ft");
+    static SGConstPropertyNode_ptr altitude = fgGetNode("/position/altitude-ft");
     double alt;
     double sea_level_radius_meters, lat_geoc;
 
@@ -926,7 +926,7 @@ void FGJSBsim::set_Longitude(double lon)
 
 void FGJSBsim::set_Altitude(double alt)
 {
-    static const SGPropertyNode *latitude = fgGetNode("/position/latitude-deg");
+    static SGConstPropertyNode_ptr latitude = fgGetNode("/position/latitude-deg");
 
     double sea_level_radius_meters,lat_geoc;
 
diff --git a/src/FDM/JSBSim/JSBSim.hxx b/src/FDM/JSBSim/JSBSim.hxx
index 098cc38e3..cc2cfb03a 100644
--- a/src/FDM/JSBSim/JSBSim.hxx
+++ b/src/FDM/JSBSim/JSBSim.hxx
@@ -226,42 +226,42 @@ private:
     double trim_elev;
     double trim_throttle;
 
-    SGPropertyNode *startup_trim;
-    SGPropertyNode *trimmed;
-    SGPropertyNode *pitch_trim;
-    SGPropertyNode *throttle_trim;
-    SGPropertyNode *aileron_trim;
-    SGPropertyNode *rudder_trim;
-    SGPropertyNode *stall_warning;
+    SGPropertyNode_ptr startup_trim;
+    SGPropertyNode_ptr trimmed;
+    SGPropertyNode_ptr pitch_trim;
+    SGPropertyNode_ptr throttle_trim;
+    SGPropertyNode_ptr aileron_trim;
+    SGPropertyNode_ptr rudder_trim;
+    SGPropertyNode_ptr stall_warning;
 
-    /* SGPropertyNode *elevator_pos_deg;
-    SGPropertyNode *left_aileron_pos_deg;
-    SGPropertyNode *right_aileron_pos_deg;
-    SGPropertyNode *rudder_pos_deg;
-    SGPropertyNode *flap_pos_deg; */
+    /* SGPropertyNode_ptr elevator_pos_deg;
+    SGPropertyNode_ptr left_aileron_pos_deg;
+    SGPropertyNode_ptr right_aileron_pos_deg;
+    SGPropertyNode_ptr rudder_pos_deg;
+    SGPropertyNode_ptr flap_pos_deg; */
 
 
-    SGPropertyNode *elevator_pos_pct;
-    SGPropertyNode *left_aileron_pos_pct;
-    SGPropertyNode *right_aileron_pos_pct;
-    SGPropertyNode *rudder_pos_pct;
-    SGPropertyNode *flap_pos_pct;
-    SGPropertyNode *speedbrake_pos_pct;
-    SGPropertyNode *spoilers_pos_pct;
+    SGPropertyNode_ptr elevator_pos_pct;
+    SGPropertyNode_ptr left_aileron_pos_pct;
+    SGPropertyNode_ptr right_aileron_pos_pct;
+    SGPropertyNode_ptr rudder_pos_pct;
+    SGPropertyNode_ptr flap_pos_pct;
+    SGPropertyNode_ptr speedbrake_pos_pct;
+    SGPropertyNode_ptr spoilers_pos_pct;
 
-    SGPropertyNode *gear_pos_pct;
+    SGPropertyNode_ptr gear_pos_pct;
 
-    SGPropertyNode *temperature;
-    SGPropertyNode *pressure;
-    SGPropertyNode *density;
-    SGPropertyNode *turbulence_gain;
-    SGPropertyNode *turbulence_rate;
+    SGPropertyNode_ptr temperature;
+    SGPropertyNode_ptr pressure;
+    SGPropertyNode_ptr density;
+    SGPropertyNode_ptr turbulence_gain;
+    SGPropertyNode_ptr turbulence_rate;
 
-    SGPropertyNode *wind_from_north;
-    SGPropertyNode *wind_from_east;
-    SGPropertyNode *wind_from_down;
+    SGPropertyNode_ptr wind_from_north;
+    SGPropertyNode_ptr wind_from_east;
+    SGPropertyNode_ptr wind_from_down;
 
-    SGPropertyNode *slaved;
+    SGPropertyNode_ptr slaved;
 
     void init_gear(void);
     void update_gear(void);
diff --git a/src/FDM/JSBSim/input_output/FGPropertyManager.cpp b/src/FDM/JSBSim/input_output/FGPropertyManager.cpp
index 61aed893f..f8b857368 100755
--- a/src/FDM/JSBSim/input_output/FGPropertyManager.cpp
+++ b/src/FDM/JSBSim/input_output/FGPropertyManager.cpp
@@ -48,6 +48,8 @@ COMMENTS, REFERENCES, and NOTES [use "class documentation" below for API docs]
 
 namespace JSBSim {
 
+bool FGPropertyManager::suppress_warning = true;
+
 //%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 string FGPropertyManager::mkPropertyName(string name, bool lowercase) {
diff --git a/src/FDM/JSBSim/input_output/FGPropertyManager.h b/src/FDM/JSBSim/input_output/FGPropertyManager.h
index 001d16db4..ce7161524 100644
--- a/src/FDM/JSBSim/input_output/FGPropertyManager.h
+++ b/src/FDM/JSBSim/input_output/FGPropertyManager.h
@@ -73,7 +73,7 @@ CLASS DECLARATION
 class FGPropertyManager : public SGPropertyNode, public FGJSBBase
 {
   private:
-    bool suppress_warning;
+    static bool suppress_warning;
   public:
     /// Constructor
     FGPropertyManager(void) {suppress_warning = false;}