diff --git a/server/gameserver/buff.cc b/server/gameserver/buff.cc
index 28bb87b2..74cc7ecf 100644
--- a/server/gameserver/buff.cc
+++ b/server/gameserver/buff.cc
@@ -603,8 +603,8 @@ void Buff::ProcTurnOver()
              });
 
         Position curr_pos = owner->GetPos();
-        a8::Vec2 dir = old_pos.Distance2D2(owner->GetPos());
-        dir.Normalize();
+        glm::vec3 dir = old_pos.CalcDir(owner->GetPos());
+        GlmHelper::Normalize(dir);
         for (int i = 5; i < moved_distance; i += 5) {
             // 999
             #if 1