diff --git a/backend/lib/tasks/export_nico.rake b/backend/lib/tasks/export_nico.rake
index c0c6c9f..444a58c 100644
--- a/backend/lib/tasks/export_nico.rake
+++ b/backend/lib/tasks/export_nico.rake
@@ -3,8 +3,8 @@ namespace :nico do
   task export: :environment do
     require 'open3'
 
-    mysql_user = ENV.fetch('MYSQL_USER')
-    mysql_pass = ENV.fetch('MYSQL_PASS')
+    mysql_user = ENV.fetch('NIZIKA_NICO_MYSQL_USER')
+    mysql_pass = ENV.fetch('NIZIKA_NICO_MYSQL_PASS')
     nizika_nico_path = ENV.fetch('NIZIKA_NICO_PATH')
 
     videos = Post.where('url LIKE ?', '%nicovideo.jp/watch/%').pluck(:url).filter_map {
@@ -14,7 +14,7 @@ namespace :nico do
     next if videos.empty?
 
     _, stderr, status = Open3.capture3(
-        { 'MYSQL_USER' => mysql_user, 'MYSQL_PASS' => mysql_pass },
+        { 'NIZIKA_NICO_MYSQL_USER' => mysql_user, 'NIZIKA_NICO_MYSQL_PASS' => mysql_pass },
         'python3', '-m', 'tracked_videos.put_bulk_upsert', *videos,
         chdir: nizika_nico_path)
 
diff --git a/backend/lib/tasks/sync_nico.rake b/backend/lib/tasks/sync_nico.rake
index db386a3..04dde3e 100644
--- a/backend/lib/tasks/sync_nico.rake
+++ b/backend/lib/tasks/sync_nico.rake
@@ -54,11 +54,11 @@ namespace :nico do
           .find_each(&:destroy!)
     end
 
-    mysql_user = ENV['MYSQL_USER']
-    mysql_pass = ENV['MYSQL_PASS']
+    mysql_user = ENV['NIZIKA_NICO_MYSQL_USER']
+    mysql_pass = ENV['NIZIKA_NICO_MYSQL_PASS']
     nizika_nico_path = ENV['NIZIKA_NICO_PATH']
     stdout, stderr, status = Open3.capture3(
-        { 'MYSQL_USER' => mysql_user, 'MYSQL_PASS' => mysql_pass },
+        { 'NIZIKA_NICO_MYSQL_USER' => mysql_user, 'NIZIKA_NICO_MYSQL_PASS' => mysql_pass },
         'python3', "#{ nizika_nico_path }/get_videos.py")
 
     unless status.success?