diff --git a/telephony/java/android/telephony/DisconnectCause.java b/telephony/java/android/telephony/DisconnectCause.java
index 3fb6be7afa8b0..6fe10dc9d2564 100644
--- a/telephony/java/android/telephony/DisconnectCause.java
+++ b/telephony/java/android/telephony/DisconnectCause.java
@@ -263,7 +263,7 @@ public class DisconnectCause {
         case OUTGOING_CANCELED:
             return "OUTGOING_CANCELED";
         default:
-            return "INVALID";
+            return "INVALID: " + cause;
         }
     }
 }