-#include <FGJSBBase.h>
-#include <input_output/FGXMLElement.h>
-#include <math/FGColumnVector3.h>
-#include <models/propulsion/FGForce.h>
-#include <math/FGFunction.h>
+#include "FGJSBBase.h"
+#include "math/FGColumnVector3.h"
+#include "models/propulsion/FGForce.h"
+#include "math/FGFunction.h"