diff --git a/dom/system/gonk/RadioInterfaceLayer.js b/dom/system/gonk/RadioInterfaceLayer.js
index f35b8e17802..9a107beeb78 100644
--- a/dom/system/gonk/RadioInterfaceLayer.js
+++ b/dom/system/gonk/RadioInterfaceLayer.js
@@ -61,6 +61,8 @@ const DOM_SMS_DELIVERY_SENDING           = "sending";
 const DOM_SMS_DELIVERY_SENT              = "sent";
 const DOM_SMS_DELIVERY_ERROR             = "error";
 
+const CALL_WAKELOCK_TIMEOUT              = 5000;
+
 const RIL_IPC_TELEPHONY_MSG_NAMES = [
   "RIL:EnumerateCalls",
   "RIL:GetMicrophoneMuted",
@@ -107,6 +109,10 @@ const RIL_IPC_CELLBROADCAST_MSG_NAMES = [
   "RIL:RegisterCellBroadcastMsg"
 ];
 
+XPCOMUtils.defineLazyServiceGetter(this, "gPowerManagerService",
+                                   "@mozilla.org/power/powermanagerservice;1",
+                                   "nsIPowerManagerService");
+
 XPCOMUtils.defineLazyServiceGetter(this, "gSmsService",
                                    "@mozilla.org/sms/smsservice;1",
                                    "nsISmsService");
@@ -1237,6 +1243,18 @@ RadioInterfaceLayer.prototype = {
     }
   },
 
+  _callRingWakeLock: null,
+  _callRingWakeLockTimer: null,
+  _cancelCallRingWakeLockTimer: function _cancelCallRingWakeLockTimer() {
+    if (this._callRingWakeLockTimer) {
+      this._callRingWakeLockTimer.cancel();
+    }
+    if (this._callRingWakeLock) {
+      this._callRingWakeLock.unlock();
+      this._callRingWakeLock = null;
+    }
+  },
+
   /**
    * Handle an incoming call.
    *
@@ -1244,6 +1262,17 @@ RadioInterfaceLayer.prototype = {
    * to start bringing up the Phone app already.
    */
   handleCallRing: function handleCallRing() {
+    if (!this._callRingWakeLock) {
+      this._callRingWakeLock = gPowerManagerService.newWakeLock("cpu");
+    }
+    if (!this._callRingWakeLockTimer) {
+      this._callRingWakeLockTimer =
+        Cc["@mozilla.org/timer;1"].createInstance(Ci.nsITimer);
+    }
+    this._callRingWakeLockTimer
+        .initWithCallback(this._cancelCallRingWakeLockTimer.bind(this),
+                          CALL_WAKELOCK_TIMEOUT, Ci.nsITimer.TYPE_ONE_SHOT);
+
     gSystemMessenger.broadcastMessage("telephony-new-call", {});
   },
 
@@ -1724,6 +1753,8 @@ RadioInterfaceLayer.prototype = {
         for (let msgname of RIL_IPC_CELLBROADCAST_MSG_NAMES) {
           ppmm.removeMessageListener(msgname, this);
         }
+        // Cancel the timer for the call-ring wake lock.
+        this._cancelCallRingWakeLockTimer();
         // Shutdown all RIL network interfaces
         this.dataNetworkInterface.shutdown();
         this.mmsNetworkInterface.shutdown();