diff --git a/src/modules/flight_mode_manager/FlightModeManager.cpp b/src/modules/flight_mode_manager/FlightModeManager.cpp
index 4ed455806a..8c70e09f12 100644
--- a/src/modules/flight_mode_manager/FlightModeManager.cpp
+++ b/src/modules/flight_mode_manager/FlightModeManager.cpp
@@ -296,14 +296,6 @@ void FlightModeManager::handleCommand()
 				}
 			}
 
-			// send back acknowledgment
-			vehicle_command_ack_s command_ack{};
-			command_ack.command = command.command;
-			command_ack.result = cmd_result;
-			command_ack.target_system = command.source_system;
-			command_ack.target_component = command.source_component;
-			command_ack.timestamp = hrt_absolute_time();
-			_vehicle_command_ack_pub.publish(command_ack);
 
 		} else if (_current_task.task) {
 			// check for other commands not related to task switching
diff --git a/src/modules/flight_mode_manager/FlightModeManager.hpp b/src/modules/flight_mode_manager/FlightModeManager.hpp
index 74168d3e2f..7f7aea1171 100644
--- a/src/modules/flight_mode_manager/FlightModeManager.hpp
+++ b/src/modules/flight_mode_manager/FlightModeManager.hpp
@@ -50,7 +50,6 @@
 #include <uORB/topics/trajectory_setpoint.h>
 #include <uORB/topics/vehicle_attitude_setpoint.h>
 #include <uORB/topics/vehicle_command.h>
-#include <uORB/topics/vehicle_command_ack.h>
 #include <uORB/topics/vehicle_control_mode.h>
 #include <uORB/topics/vehicle_land_detected.h>
 #include <uORB/topics/vehicle_local_position.h>
@@ -150,7 +149,6 @@ private:
 
 	uORB::Publication<landing_gear_s> _landing_gear_pub{ORB_ID(landing_gear)};
 	uORB::Publication<trajectory_setpoint_s> _trajectory_setpoint_pub{ORB_ID(trajectory_setpoint)};
-	uORB::Publication<vehicle_command_ack_s> _vehicle_command_ack_pub{ORB_ID(vehicle_command_ack)};
 	uORB::Publication<vehicle_constraints_s> _vehicle_constraints_pub{ORB_ID(vehicle_constraints)};
 
 	DEFINE_PARAMETERS(