diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 6f0815c32..a1a819a42 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -138,7 +138,7 @@
             android:name=".ui.main.MainActivity"
             android:alwaysRetainTaskState="true"
             android:enableOnBackInvokedCallback="true"
-            android:exported="true">
+            android:exported="false">
         </activity>
         <activity
             android:name=".ui.welcome.WelcomeActivity"
diff --git a/app/src/main/java/io/legato/kazusa/help/LauncherIconHelp.kt b/app/src/main/java/io/legato/kazusa/help/LauncherIconHelp.kt
index f5e78da43..06da54b19 100644
--- a/app/src/main/java/io/legato/kazusa/help/LauncherIconHelp.kt
+++ b/app/src/main/java/io/legato/kazusa/help/LauncherIconHelp.kt
@@ -25,7 +25,7 @@ object LauncherIconHelp {
     // 主Activity的ComponentName
     private val mainActivity = ComponentName(
         appCtx.packageName,
-        "${appCtx.packageName}.ui.main.MainActivity"
+        "${appCtx.packageName}.ui.welcome.SplashActivity"
     )
 
     fun changeIcon(icon: String?) {