diff --git a/src/px4_connection/src/px4_controller.cpp b/src/px4_connection/src/px4_controller.cpp
index e5082311..fbcdb0de 100644
--- a/src/px4_connection/src/px4_controller.cpp
+++ b/src/px4_connection/src/px4_controller.cpp
@@ -273,7 +273,7 @@ private:
 
         msg.velocity[0] = velocity[0];
         msg.velocity[1] = velocity[1];
-        msg.velocity[2] = velocity[2];
+        msg.velocity[2] = -velocity[2];
         for (int i = 0; i < 3; i++)
         {
             msg.position[i] = NAN;