diff --git a/src/com/android/server/telecom/CallsManager.java b/src/com/android/server/telecom/CallsManager.java
index 25f6f34..f7953b1 100644
--- a/src/com/android/server/telecom/CallsManager.java
+++ b/src/com/android/server/telecom/CallsManager.java
@@ -1813,8 +1813,8 @@
     }
 
     private boolean isRttSettingOn() {
-        return Settings.System.getInt(mContext.getContentResolver(),
-                Settings.System.RTT_CALLING_MODE, 0) != 0;
+        return Settings.Secure.getInt(mContext.getContentResolver(),
+                Settings.Secure.RTT_CALLING_MODE, 0) != 0;
     }
 
     void phoneAccountSelected(Call call, PhoneAccountHandle account, boolean setDefault) {