diff --git a/server/gameserver/player.cc b/server/gameserver/player.cc
index e656c7e..83d83e4 100644
--- a/server/gameserver/player.cc
+++ b/server/gameserver/player.cc
@@ -811,10 +811,8 @@ void Player::_CMMove(f8::MsgHdr& hdr, const cs::CMMove& msg)
     #endif
     if (!a8::HasBitFlag(status, HS_Fly)) {
         if (msg.has_attack_dir()) {
-            if (!std::isfinite(msg.attack_dir().x()) &&
-                !std::isfinite(msg.attack_dir().y()) &&
-                !std::isnan(msg.attack_dir().x()) &&
-                !std::isnan(msg.attack_dir().y())
+            if (std::isfinite(msg.attack_dir().x()) &&
+                std::isfinite(msg.attack_dir().y())
                 )
                 {
                     attack_dir.FromPB(&msg.attack_dir());