diff --git a/dom/system/gonk/RadioInterfaceLayer.js b/dom/system/gonk/RadioInterfaceLayer.js
index 16d9bdaca00a..ef6bec53a110 100644
--- a/dom/system/gonk/RadioInterfaceLayer.js
+++ b/dom/system/gonk/RadioInterfaceLayer.js
@@ -194,8 +194,6 @@ function convertRILCallState(state) {
     case RIL.CALL_STATE_INCOMING:
     case RIL.CALL_STATE_WAITING:
       return nsITelephonyProvider.CALL_STATE_INCOMING;
-    case RIL.CALL_STATE_BUSY:
-      return nsITelephonyProvider.CALL_STATE_BUSY;
     default:
       throw new Error("Unknown rilCallState: " + state);
   }
diff --git a/dom/system/gonk/ril_consts.js b/dom/system/gonk/ril_consts.js
index d77997f1dcbb..cc006a3ce9cf 100644
--- a/dom/system/gonk/ril_consts.js
+++ b/dom/system/gonk/ril_consts.js
@@ -442,7 +442,6 @@ this.CALL_STATE_DIALING = 2;
 this.CALL_STATE_ALERTING = 3;
 this.CALL_STATE_INCOMING = 4;
 this.CALL_STATE_WAITING = 5;
-this.CALL_STATE_BUSY = 6;
 
 this.TOA_INTERNATIONAL = 0x91;
 this.TOA_UNKNOWN = 0x81;
diff --git a/dom/system/gonk/ril_worker.js b/dom/system/gonk/ril_worker.js
index 5cda64cadec1..807a811853f7 100644
--- a/dom/system/gonk/ril_worker.js
+++ b/dom/system/gonk/ril_worker.js
@@ -4690,11 +4690,6 @@ RIL[REQUEST_LAST_CALL_FAIL_CAUSE] = function REQUEST_LAST_CALL_FAIL_CAUSE(length
     case CALL_FAIL_NORMAL:
       this._handleDisconnectedCall(options);
       break;
-    case CALL_FAIL_BUSY:
-      options.state = CALL_STATE_BUSY;
-      this._handleChangedCallState(options);
-      this._handleDisconnectedCall(options);
-      break;
     default:
       options.rilMessageType = "callError";
       options.errorMsg = RIL_CALL_FAILCAUSE_TO_GECKO_CALL_ERROR[failCause];