diff --git a/join.lua b/join.lua
index 515d8e4..5469c2c 100644
--- a/join.lua
+++ b/join.lua
@@ -207,18 +207,21 @@ if minetest.settings:get_bool("fediauth.position_lock", true) then
 	    for _,player in pairs(minetest.get_connected_players()) do
 		local playername = player:get_player_name()
 		local playerpos = player:get_pos()
+		local current_vel = player:get_velocity()
 		if fediauth_sessions[playername] ~= nil then
 			if playerpos ~= playerpos_stor[playername] then -- position lock, stupid, but works as possible
 				-- maybe compatible with others mods who override physics
-				-- player can't move too far (around 1-2 blocks, default walk speed)
+				-- player can't move too far (around 0.5-2 blocks)
 				-- Why not just kick when move? Because:
 				-- - if you joined and fall from sky without fly privege
 				-- - if your position on slope and etc...
 				-- Why not just use physics override? Because
 				-- - It not work with mod like flyspeed
-				player:add_velocity({x = (playerpos_stor[playername].x - playerpos.x) * 2,
-						     y = (playerpos_stor[playername].y - playerpos.y) * 2,
-						     z = (playerpos_stor[playername].z - playerpos.z) * 2})
+				
+				-- prevent high speed glitches as possible
+				player:add_velocity({x = current_vel.x * -1,
+						     y = current_vel.y * -1,
+						     z = current_vel.z * -1}) 
 				player:set_pos(playerpos_stor[playername])
 			end
 		end