diff --git a/overlay/frameworks/base/core/res/res/values/config.xml b/overlay/frameworks/base/core/res/res/values/config.xml
index 34fa19f6..487941d0 100644
--- a/overlay/frameworks/base/core/res/res/values/config.xml
+++ b/overlay/frameworks/base/core/res/res/values/config.xml
@@ -181,6 +181,9 @@
 
     <!-- MMS user agent string -->
     <string name="config_mms_user_agent" translatable="false">Android-Mms/2.0</string>
+    
+    <!-- reference volume index for music stream to limit headphone volume and display warning -->
+    <integer name="config_safe_media_volume_index">15</integer>
 
     <!-- MMS user agent prolfile url -->
     <string name="config_mms_user_agent_profile_url" translatable="false">http://www.google.com/oha/rdf/ua-profile-kila.xml</string>