diff --git a/core/res/AndroidManifest.xml b/core/res/AndroidManifest.xml
index 7f657eaa49f33..80775aea30f10 100644
--- a/core/res/AndroidManifest.xml
+++ b/core/res/AndroidManifest.xml
@@ -1775,12 +1775,12 @@
         android:protectionLevel="signature|privileged" />
 
     <!-- Allows applications to set the system time zone.
-         <p>Protection level: normal
+         <p>Not for use by third-party applications.
     -->
     <permission android:name="android.permission.SET_TIME_ZONE"
         android:label="@string/permlab_setTimeZone"
         android:description="@string/permdesc_setTimeZone"
-        android:protectionLevel="normal" />
+        android:protectionLevel="signature|privileged" />
 
     <!-- ==================================================== -->
     <!-- Permissions related to changing status bar   -->