diff --git a/mobile/shop/orderformupdate.php b/mobile/shop/orderformupdate.php
index 78a823b18..4c11d57f0 100644
--- a/mobile/shop/orderformupdate.php
+++ b/mobile/shop/orderformupdate.php
@@ -750,8 +750,33 @@ if(!$result) {
 }
 
 // 회원이면서 포인트를 사용했다면 포인트 테이블에 사용을 추가
-if ($is_member && $od_receipt_point)
-    insert_point($member['mb_id'], (-1) * $od_receipt_point, "주문번호 $od_id 결제");
+// 동시 주문 race condition 방지 — 회원 단위 GET_LOCK + 잔액 재조회
+if ($is_member && $od_receipt_point) {
+    $point_lock_key = 'g5pt_order_'.md5($member['mb_id']);
+    $lock_row = sql_fetch(" select get_lock('$point_lock_key', 5) as lk ");
+
+    if (!empty($lock_row['lk'])) {
+        $current_point = (int) get_point_sum($member['mb_id']);
+
+        if ($current_point >= $od_receipt_point) {
+            insert_point($member['mb_id'], (-1) * $od_receipt_point, "주문번호 $od_id 결제");
+        } else {
+            // race condition 으로 잔액 부족 — 사용 가능한 만큼만 차감하고 부족분은 미수금 처리
+            $actual_point = $current_point > 0 ? $current_point : 0;
+            $shortage = $od_receipt_point - $actual_point;
+
+            if ($actual_point > 0) {
+                insert_point($member['mb_id'], (-1) * $actual_point, "주문번호 $od_id 결제");
+            }
+            sql_query(" update {$g5['g5_shop_order_table']}
+                          set od_receipt_point = '$actual_point',
+                              od_misu = od_misu + '$shortage'
+                        where od_id = '$od_id' ");
+        }
+
+        sql_query(" do release_lock('$point_lock_key') ");
+    }
+}
 
 $od_memo = nl2br(htmlspecialchars2(stripslashes($od_memo))) . " ";
 
diff --git a/shop/orderformupdate.php b/shop/orderformupdate.php
index a63af34b7..7d5912046 100644
--- a/shop/orderformupdate.php
+++ b/shop/orderformupdate.php
@@ -704,8 +704,33 @@ if(!$result) {
 }
 
 // 회원이면서 포인트를 사용했다면 테이블에 사용을 추가
-if ($is_member && $od_receipt_point)
-    insert_point($member['mb_id'], (-1) * $od_receipt_point, "주문번호 $od_id 결제");
+// 동시 주문 race condition 방지 — 회원 단위 GET_LOCK + 잔액 재조회
+if ($is_member && $od_receipt_point) {
+    $point_lock_key = 'g5pt_order_'.md5($member['mb_id']);
+    $lock_row = sql_fetch(" select get_lock('$point_lock_key', 5) as lk ");
+
+    if (!empty($lock_row['lk'])) {
+        $current_point = (int) get_point_sum($member['mb_id']);
+
+        if ($current_point >= $od_receipt_point) {
+            insert_point($member['mb_id'], (-1) * $od_receipt_point, "주문번호 $od_id 결제");
+        } else {
+            // race condition 으로 잔액 부족 — 사용 가능한 만큼만 차감하고 부족분은 미수금 처리
+            $actual_point = $current_point > 0 ? $current_point : 0;
+            $shortage = $od_receipt_point - $actual_point;
+
+            if ($actual_point > 0) {
+                insert_point($member['mb_id'], (-1) * $actual_point, "주문번호 $od_id 결제");
+            }
+            sql_query(" update {$g5['g5_shop_order_table']}
+                          set od_receipt_point = '$actual_point',
+                              od_misu = od_misu + '$shortage'
+                        where od_id = '$od_id' ");
+        }
+
+        sql_query(" do release_lock('$point_lock_key') ");
+    }
+}
 
 $od_memo = nl2br(htmlspecialchars2(stripslashes($od_memo))) . " ";