diff --git a/sw/simulator/sim_ac_jsbsim.c b/sw/simulator/sim_ac_jsbsim.cpp
similarity index 91%
rename from sw/simulator/sim_ac_jsbsim.c
rename to sw/simulator/sim_ac_jsbsim.cpp
index c7235196ff..6693a36844 100644
--- a/sw/simulator/sim_ac_jsbsim.c
+++ b/sw/simulator/sim_ac_jsbsim.cpp
@@ -35,6 +35,15 @@
 #include "main_ap.h"
 #include "main_fbw.h"
 
+/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+GLOBAL DATA
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
+
+string RootDir = "";
+string ScriptName;
+string AircraftName;
+string LogOutputName;
+JSBSim::FGFDMExec* FDMExec;
 
 /* 60Hz <-> 17ms */
 #define TIMEOUT_PERIOD 17
@@ -64,7 +73,7 @@ static void sim_init(void) {
   disp_time = 0.;
   
   // init flight model
-
+  
   // init sensors
 
   // init environment
@@ -137,6 +146,11 @@ static void sim_display(void) {
 
 int main ( int argc, char** argv) {
 
+  ScriptName = "";
+  AircraftName = "";
+  LogOutputName = "";
+  bool result = false;
+
   sim_parse_options(argc, argv);
 
   sim_init();