diff --git a/bbs/delete.php b/bbs/delete.php
index b2df50c36..b7c2b18e8 100644
--- a/bbs/delete.php
+++ b/bbs/delete.php
@@ -82,15 +82,17 @@ while ($row = sql_fetch_array($result))
         while ($row2 = sql_fetch_array($result2)) {
             @unlink(G4_DATA_PATH.'/file/'.$bo_table.'/'.$row2['bf_file']);
             // 썸네일삭제
-            $dir = G4_DATA_PATH.'/file/'.$bo_table;
-            if($dh = opendir($dir)) {
-                while(($file = readdir($dh)) !== false) {
-                    if($file == "." || $file == "..")
-                        continue;
+            if(preg_match("/\.({$config['cf_image_extension']})$/i", $row2['bf_file']) {
+                $dir = G4_DATA_PATH.'/file/'.$bo_table;
+                if($dh = opendir($dir)) {
+                    while(($file = readdir($dh)) !== false) {
+                        if($file == "." || $file == "..")
+                            continue;
 
-                    $filename = preg_replace("/\.[^\.]+$/i", "", $row2['bf_file']);
-                    if(strstr($file, $filename) && strpos($file, $filename) != 0) {
-                        @unlink($dir.'/'.$file);
+                        $filename = preg_replace("/\.[^\.]+$/i", "", $row2['bf_file']);
+                        if(strstr($file, $filename) && strpos($file, $filename) != 0) {
+                            @unlink($dir.'/'.$file);
+                        }
                     }
                 }
             }
diff --git a/bbs/delete_all.php b/bbs/delete_all.php
index de4d0905e..e6a7107fb 100644
--- a/bbs/delete_all.php
+++ b/bbs/delete_all.php
@@ -95,15 +95,17 @@ for ($i=count($tmp_array)-1; $i>=0; $i--)
                 @unlink(G4_DATA_PATH.'/file/'.$bo_table.'/'.$row2['bf_file']);
 
                 // 썸네일삭제
-                $dir = G4_DATA_PATH.'/file/'.$bo_table;
-                if($dh = opendir($dir)) {
-                    while(($file = readdir($dh)) !== false) {
-                        if($file == "." || $file == "..")
-                            continue;
+                if(preg_match("/\.({$config['cf_image_extension']})$/i", $row2['bf_file']) {
+                    $dir = G4_DATA_PATH.'/file/'.$bo_table;
+                    if($dh = opendir($dir)) {
+                        while(($file = readdir($dh)) !== false) {
+                            if($file == "." || $file == "..")
+                                continue;
 
-                        $filename = preg_replace("/\.[^\.]+$/i", "", $row2['bf_file']);
-                        if(strstr($file, $filename) && strpos($file, $filename) != 0) {
-                            @unlink($dir.'/'.$file);
+                            $filename = preg_replace("/\.[^\.]+$/i", "", $row2['bf_file']);
+                            if(strstr($file, $filename) && strpos($file, $filename) != 0) {
+                                @unlink($dir.'/'.$file);
+                            }
                         }
                     }
                 }