diff --git a/scripts/fiber/tests-failing.txt b/scripts/fiber/tests-failing.txt
index 8db2ea6703..8d705c30e8 100644
--- a/scripts/fiber/tests-failing.txt
+++ b/scripts/fiber/tests-failing.txt
@@ -18,9 +18,6 @@ src/isomorphic/modern/element/__tests__/ReactJSXElementValidator-test.js
 src/renderers/dom/__tests__/ReactDOMProduction-test.js
 * should throw with an error code in production
 
-src/renderers/dom/fiber/__tests__/ReactDOMFiber-test.js
-* should reconcile portal children
-
 src/renderers/dom/shared/__tests__/ReactDOM-test.js
 * throws in render() if the mount callback is not a function
 * throws in render() if the update callback is not a function
diff --git a/scripts/fiber/tests-passing.txt b/scripts/fiber/tests-passing.txt
index 7143e78caa..6eca915bf1 100644
--- a/scripts/fiber/tests-passing.txt
+++ b/scripts/fiber/tests-passing.txt
@@ -514,6 +514,7 @@ src/renderers/dom/fiber/__tests__/ReactDOMFiber-test.js
 * should render one portal
 * should render many portals
 * should render nested portals
+* should reconcile portal children
 * should keep track of namespace across portals (simple)
 * should keep track of namespace across portals (medium)
 * should keep track of namespace across portals (complex)
diff --git a/src/renderers/shared/fiber/ReactChildFiber.js b/src/renderers/shared/fiber/ReactChildFiber.js
index 413fd234f6..175dded7c0 100644
--- a/src/renderers/shared/fiber/ReactChildFiber.js
+++ b/src/renderers/shared/fiber/ReactChildFiber.js
@@ -341,7 +341,7 @@ function ChildReconciler(shouldClone, shouldTrackSideEffects) {
     } else {
       // Update
       const existing = useFiber(current, priority);
-      existing.pendingProps = portal.children;
+      existing.pendingProps = portal;
       existing.return = returnFiber;
       return existing;
     }
@@ -976,7 +976,7 @@ function ChildReconciler(shouldClone, shouldTrackSideEffects) {
         ) {
           deleteRemainingChildren(returnFiber, child.sibling);
           const existing = useFiber(child, priority);
-          existing.pendingProps = portal.children;
+          existing.pendingProps = portal;
           existing.return = returnFiber;
           return existing;
         } else {
diff --git a/src/renderers/shared/fiber/ReactFiber.js b/src/renderers/shared/fiber/ReactFiber.js
index 98e47ecaab..e6badf8e93 100644
--- a/src/renderers/shared/fiber/ReactFiber.js
+++ b/src/renderers/shared/fiber/ReactFiber.js
@@ -346,7 +346,7 @@ exports.createFiberFromYield = function(yieldNode : ReactYield, priorityLevel :
 
 exports.createFiberFromPortal = function(portal : ReactPortal, priorityLevel : PriorityLevel) : Fiber {
   const fiber = createFiber(HostPortal, portal.key);
-  fiber.pendingProps = portal.children;
+  fiber.pendingProps = portal;
   fiber.pendingWorkPriority = priorityLevel;
   fiber.stateNode = {
     containerInfo: portal.containerInfo,
diff --git a/src/renderers/shared/fiber/ReactFiberBeginWork.js b/src/renderers/shared/fiber/ReactFiberBeginWork.js
index ca68c0d01b..62447db5c3 100644
--- a/src/renderers/shared/fiber/ReactFiberBeginWork.js
+++ b/src/renderers/shared/fiber/ReactFiberBeginWork.js
@@ -325,7 +325,7 @@ module.exports = function<T, P, I, TI, C, CX>(
 
   function updatePortalComponent(current, workInProgress) {
     const priorityLevel = workInProgress.pendingWorkPriority;
-    const nextChildren = workInProgress.pendingProps;
+    const nextChildren = workInProgress.pendingProps.children;
     if (!current) {
       // Portals are special because we don't append the children during mount
       // but at commit. Therefore we need to track insertions which the normal