diff --git a/src/commande-abs.cpp b/src/commande-abs.cpp
index d5e118e..291e3ef 100644
--- a/src/commande-abs.cpp
+++ b/src/commande-abs.cpp
@@ -65,7 +65,7 @@ class Run
        mvt->angular.z * angle_vel;
      }
 
-      assert(mvt->linear.x != 0. || mvt->linear.y != 0.);
+      assert(mvt->linear.x == 0. || mvt->linear.y == 0.);
       pub.publish(mvt);
       ROS_INFO("cmd published");
     }//end publish