if ( !fgHasNode("/sim/presets/speed-set") ) {
set_V_calibrated_kts(0.0);
} else {
- const string speedset = fgGetString("/sim/presets/speed-set");
+ const std::string speedset = fgGetString("/sim/presets/speed-set");
if ( speedset == "knots" || speedset == "KNOTS" ) {
set_V_calibrated_kts( fgGetDouble("/sim/presets/airspeed-kt") );
} else if ( speedset == "mach" || speedset == "MACH" ) {