diff --git a/background.js b/background.js
index 7dd4822..8f29616 100755
--- a/background.js
+++ b/background.js
@@ -72,12 +72,12 @@
                 getTagsTag(function(tag){
                     for (var i in selectTags) {
                         if (tag == selectTags[i]) {
-                            chrome.tabs.executeScript(null, {file: "content_script.js"});
+                            chrome.tabs.executeScript(targetTabId, {file: "content_script.js"});
                         }
                     }
                 });
             } else {
-                chrome.tabs.executeScript(null, {file: "content_script.js"});
+                chrome.tabs.executeScript(targetTabId, {file: "content_script.js"});
             }
         } else {
             stop("選択されたマイリストにはこれ以上動画を追加できません");