diff --git a/mobile/skin/shop/basic/list.sort.skin.php b/mobile/skin/shop/basic/list.sort.skin.php
index 2897bc526..6c0e58c45 100644
--- a/mobile/skin/shop/basic/list.sort.skin.php
+++ b/mobile/skin/shop/basic/list.sort.skin.php
@@ -2,10 +2,14 @@
 if (!defined("_GNUBOARD_")) exit; // 개별 페이지 접근 불가
 
 $sct_sort_href = $_SERVER['SCRIPT_NAME'].'?';
-if($ca_id)
-    $sct_sort_href .= 'ca_id='.$ca_id;
-else if($ev_id)
+
+if($ca_id) {
+	$shop_category_url = shop_category_url($ca_id);
+    $sct_sort_href = (strpos($shop_category_url, '?') === false) ? $shop_category_url.'?1=1' : $shop_category_url;
+} else if($ev_id) {
     $sct_sort_href .= 'ev_id='.$ev_id;
+}
+
 if($skin)
     $sct_sort_href .= '&skin='.$skin;
 $sct_sort_href .= '&sort=';
diff --git a/skin/shop/basic/list.sort.skin.php b/skin/shop/basic/list.sort.skin.php
index ad19e92e0..b5ba4c0fd 100644
--- a/skin/shop/basic/list.sort.skin.php
+++ b/skin/shop/basic/list.sort.skin.php
@@ -3,10 +3,12 @@ if (!defined("_GNUBOARD_")) exit; // 개별 페이지 접근 불가
 
 $sct_sort_href = $_SERVER['SCRIPT_NAME'].'?';
 
-if($ca_id)
-    $sct_sort_href = shop_category_url($ca_id).'?1=1';
-else if($ev_id)
+if($ca_id) {
+	$shop_category_url = shop_category_url($ca_id);
+    $sct_sort_href = (strpos($shop_category_url, '?') === false) ? $shop_category_url.'?1=1' : $shop_category_url;
+} else if($ev_id) {
     $sct_sort_href .= 'ev_id='.$ev_id;
+}
 
 if($skin)
     $sct_sort_href .= '&skin='.$skin;
diff --git a/theme/basic/mobile/skin/shop/basic/list.sort.skin.php b/theme/basic/mobile/skin/shop/basic/list.sort.skin.php
index 2897bc526..6c0e58c45 100644
--- a/theme/basic/mobile/skin/shop/basic/list.sort.skin.php
+++ b/theme/basic/mobile/skin/shop/basic/list.sort.skin.php
@@ -2,10 +2,14 @@
 if (!defined("_GNUBOARD_")) exit; // 개별 페이지 접근 불가
 
 $sct_sort_href = $_SERVER['SCRIPT_NAME'].'?';
-if($ca_id)
-    $sct_sort_href .= 'ca_id='.$ca_id;
-else if($ev_id)
+
+if($ca_id) {
+	$shop_category_url = shop_category_url($ca_id);
+    $sct_sort_href = (strpos($shop_category_url, '?') === false) ? $shop_category_url.'?1=1' : $shop_category_url;
+} else if($ev_id) {
     $sct_sort_href .= 'ev_id='.$ev_id;
+}
+
 if($skin)
     $sct_sort_href .= '&skin='.$skin;
 $sct_sort_href .= '&sort=';
diff --git a/theme/basic/skin/shop/basic/list.sort.skin.php b/theme/basic/skin/shop/basic/list.sort.skin.php
index ad19e92e0..b5ba4c0fd 100644
--- a/theme/basic/skin/shop/basic/list.sort.skin.php
+++ b/theme/basic/skin/shop/basic/list.sort.skin.php
@@ -3,10 +3,12 @@ if (!defined("_GNUBOARD_")) exit; // 개별 페이지 접근 불가
 
 $sct_sort_href = $_SERVER['SCRIPT_NAME'].'?';
 
-if($ca_id)
-    $sct_sort_href = shop_category_url($ca_id).'?1=1';
-else if($ev_id)
+if($ca_id) {
+	$shop_category_url = shop_category_url($ca_id);
+    $sct_sort_href = (strpos($shop_category_url, '?') === false) ? $shop_category_url.'?1=1' : $shop_category_url;
+} else if($ev_id) {
     $sct_sort_href .= 'ev_id='.$ev_id;
+}
 
 if($skin)
     $sct_sort_href .= '&skin='.$skin;