diff --git a/ROMFS/px4fmu_common/init.d-posix/airframes/10042_sihsim_xvert b/ROMFS/px4fmu_common/init.d-posix/airframes/10042_sihsim_xvert
index 1409d90094..c09d24a8bf 100644
--- a/ROMFS/px4fmu_common/init.d-posix/airframes/10042_sihsim_xvert
+++ b/ROMFS/px4fmu_common/init.d-posix/airframes/10042_sihsim_xvert
@@ -11,6 +11,8 @@
 PX4_SIMULATOR=${PX4_SIMULATOR:=sihsim}
 PX4_SIM_MODEL=${PX4_SIM_MODEL:=xvert}
 
+param set-default EKF2_FUSE_BETA 0 # side slip fusion is currently not supported for tailsitters
+
 param set-default SENS_EN_GPSSIM 1
 param set-default SENS_EN_BAROSIM 1
 param set-default SENS_EN_MAGSIM 1
diff --git a/ROMFS/px4fmu_common/init.d-posix/airframes/1041_gazebo-classic_tailsitter b/ROMFS/px4fmu_common/init.d-posix/airframes/1041_gazebo-classic_tailsitter
index 454ff8b8b2..efcff63995 100644
--- a/ROMFS/px4fmu_common/init.d-posix/airframes/1041_gazebo-classic_tailsitter
+++ b/ROMFS/px4fmu_common/init.d-posix/airframes/1041_gazebo-classic_tailsitter
@@ -9,6 +9,8 @@
 
 param set-default MAV_TYPE 20
 
+param set-default EKF2_FUSE_BETA 0 # side slip fusion is currently not supported for tailsitters
+
 param set-default CA_AIRFRAME 4
 
 param set-default CA_ROTOR_COUNT 4
diff --git a/ROMFS/px4fmu_common/init.d/airframes/1102_tailsitter_duo_sih.hil b/ROMFS/px4fmu_common/init.d/airframes/1102_tailsitter_duo_sih.hil
index 9ba9822367..9003e546cb 100644
--- a/ROMFS/px4fmu_common/init.d/airframes/1102_tailsitter_duo_sih.hil
+++ b/ROMFS/px4fmu_common/init.d/airframes/1102_tailsitter_duo_sih.hil
@@ -17,6 +17,8 @@
 
 . ${R}etc/init.d/rc.vtol_defaults
 
+param set-default EKF2_FUSE_BETA 0 # side slip fusion is currently not supported for tailsitters
+
 param set UAVCAN_ENABLE 0
 param set-default VT_ELEV_MC_LOCK 0
 param set-default VT_MOT_COUNT 2
diff --git a/ROMFS/px4fmu_common/init.d/airframes/13200_generic_vtol_tailsitter b/ROMFS/px4fmu_common/init.d/airframes/13200_generic_vtol_tailsitter
index 8e0ca8e0b6..fccaee8cf5 100644
--- a/ROMFS/px4fmu_common/init.d/airframes/13200_generic_vtol_tailsitter
+++ b/ROMFS/px4fmu_common/init.d/airframes/13200_generic_vtol_tailsitter
@@ -12,6 +12,8 @@
 
 . ${R}etc/init.d/rc.vtol_defaults
 
+param set-default EKF2_FUSE_BETA 0 # side slip fusion is currently not supported for tailsitters
+
 param set-default CA_AIRFRAME 4
 param set-default CA_ROTOR_COUNT 2
 param set-default CA_ROTOR0_KM -0.05
diff --git a/src/modules/ekf2/EKF2.cpp b/src/modules/ekf2/EKF2.cpp
index f7fefd4412..129c4bfdcf 100644
--- a/src/modules/ekf2/EKF2.cpp
+++ b/src/modules/ekf2/EKF2.cpp
@@ -2360,6 +2360,12 @@ void EKF2::UpdateSystemFlagsSample(ekf2_timestamps_s &ekf2_timestamps)
 
 			// let the EKF know if the vehicle motion is that of a fixed wing (forward flight only relative to wind)
 			flags.is_fixed_wing = (vehicle_status.vehicle_type == vehicle_status_s::VEHICLE_TYPE_FIXED_WING);
+
+			if (vehicle_status.is_vtol_tailsitter && _params->beta_fusion_enabled) {
+				PX4_WARN("Disable EKF beta fusion as unsupported for tailsitter");
+				_param_ekf2_fuse_beta.set(0);
+				_param_ekf2_fuse_beta.commit_no_notification();
+			}
 		}
 
 		// vehicle_land_detected
diff --git a/src/modules/ekf2/ekf2_params.c b/src/modules/ekf2/ekf2_params.c
index 6f58740372..0e3e21b3ea 100644
--- a/src/modules/ekf2/ekf2_params.c
+++ b/src/modules/ekf2/ekf2_params.c
@@ -1073,6 +1073,7 @@ PARAM_DEFINE_FLOAT(EKF2_EV_POS_Z, 0.0f);
 * value will determine the minimum airspeed which will still be fused. Set to about 90% of the vehicles stall speed.
 * Both airspeed fusion and sideslip fusion must be active for the EKF to continue navigating after loss of GPS.
 * Use EKF2_FUSE_BETA to activate sideslip fusion.
+* Note: side slip fusion is currently not supported for tailsitters.
 *
 * @group EKF2
 * @min 0.0