diff --git a/packages/scheduler/src/Scheduler.js b/packages/scheduler/src/Scheduler.js
index b046099301b3e..d2aee1b639db1 100644
--- a/packages/scheduler/src/Scheduler.js
+++ b/packages/scheduler/src/Scheduler.js
@@ -12,7 +12,8 @@
 var ImmediatePriority = 1;
 var UserBlockingPriority = 2;
 var NormalPriority = 3;
-var IdlePriority = 4;
+var LowPriority = 4;
+var IdlePriority = 5;
 
 // Max 31 bit integer. The max integer size in V8 for 32-bit systems.
 // Math.pow(2, 30) - 1
@@ -24,6 +25,7 @@ var IMMEDIATE_PRIORITY_TIMEOUT = -1;
 // Eventually times out
 var USER_BLOCKING_PRIORITY = 250;
 var NORMAL_PRIORITY_TIMEOUT = 5000;
+var LOW_PRIORITY_TIMEOUT = 10000;
 // Never times out
 var IDLE_PRIORITY = maxSigned31BitInt;
 
@@ -220,6 +222,7 @@ function unstable_runWithPriority(priorityLevel, eventHandler) {
     case ImmediatePriority:
     case UserBlockingPriority:
     case NormalPriority:
+    case LowPriority:
     case IdlePriority:
       break;
     default:
@@ -284,6 +287,9 @@ function unstable_scheduleCallback(callback, deprecated_options) {
       case IdlePriority:
         expirationTime = startTime + IDLE_PRIORITY;
         break;
+      case LowPriority:
+        expirationTime = startTime + LOW_PRIORITY_TIMEOUT;
+        break;
       case NormalPriority:
       default:
         expirationTime = startTime + NORMAL_PRIORITY_TIMEOUT;
@@ -655,6 +661,7 @@ export {
   UserBlockingPriority as unstable_UserBlockingPriority,
   NormalPriority as unstable_NormalPriority,
   IdlePriority as unstable_IdlePriority,
+  LowPriority as unstable_LowPriority,
   unstable_runWithPriority,
   unstable_scheduleCallback,
   unstable_cancelCallback,