diff --git a/src/modules/simulation/simulator_sih/sih.cpp b/src/modules/simulation/simulator_sih/sih.cpp
index 03d02507ca..4e044f52fe 100644
--- a/src/modules/simulation/simulator_sih/sih.cpp
+++ b/src/modules/simulation/simulator_sih/sih.cpp
@@ -323,11 +323,11 @@ void Sih::generate_force_and_torques()
 		// _Ma_B = -_KDW * _w_B;   // first order angular damper
 
 	} else if (_vehicle == VehicleType::SVTOL) {
-		_T_B = Vector3f(_T_MAX * 2 * _u[7], 0.0f, -_T_MAX * (+_u[0] + _u[1] + _u[2] + _u[3]));
+		_T_B = Vector3f(_T_MAX * 2 * _u[8], 0.0f, -_T_MAX * (+_u[0] + _u[1] + _u[2] + _u[3]));
 		_Mt_B = Vector3f(_L_ROLL * _T_MAX * (-_u[0] + _u[1] + _u[2] - _u[3]),
 				 _L_PITCH * _T_MAX * (+_u[0] - _u[1] + _u[2] - _u[3]),
 				 _Q_MAX * (+_u[0] + _u[1] - _u[2] - _u[3]));
-		generate_fw_aerodynamics(_u[4], _u[5], _u[6], 0);
+		generate_fw_aerodynamics(_u[4], _u[6], _u[7], 0);
 	}
 }
 
diff --git a/src/modules/simulation/simulator_sih/sih.hpp b/src/modules/simulation/simulator_sih/sih.hpp
index d6ac768081..fcbd1431b1 100644
--- a/src/modules/simulation/simulator_sih/sih.hpp
+++ b/src/modules/simulation/simulator_sih/sih.hpp
@@ -132,7 +132,7 @@ private:
 	uORB::Subscription _actuator_out_sub{ORB_ID(actuator_outputs)};
 
 	// hard constants
-	static constexpr uint16_t NB_MOTORS = 8;
+	static constexpr uint16_t NB_MOTORS = 9;
 	static constexpr float T1_C = 15.0f;                        // ground temperature in Celsius
 	static constexpr float T1_K = T1_C - atmosphere::kAbsoluteNullCelsius;   // ground temperature in Kelvin
 	static constexpr float TEMP_GRADIENT = -6.5f / 1000.0f;    // temperature gradient in degrees per metre