diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index e834d3b010..a5857f09e4 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -31,6 +31,9 @@ Runtime Behavior Changes
 * finagle-core: Request logging now defaults to disabled. Enable it by configuring the
   `RequestLogger` Stack parameter on your `Client` or `Server`. ``PHAB_ID=D308476``
 
+* finagle-core: Subtree binding failures in `NameTree.Union`'s are ignored in the
+  final binding result. ``PHAB_ID=D315282``
+
 Breaking API Changes
 ~~~~~~~~~~~~~~~~~~~~
 
diff --git a/finagle-core/src/main/scala/com/twitter/finagle/NameTree.scala b/finagle-core/src/main/scala/com/twitter/finagle/NameTree.scala
index 6146cade87..2f0ff64b32 100644
--- a/finagle-core/src/main/scala/com/twitter/finagle/NameTree.scala
+++ b/finagle-core/src/main/scala/com/twitter/finagle/NameTree.scala
@@ -185,8 +185,7 @@ object NameTree {
           case Nil => accum
           case Seq(Weighted(w, tree), tail @ _*) =>
             simplify(tree) match {
-              case Fail => unionFail
-              case Neg => loop(tail, accum)
+              case Fail | Neg => loop(tail, accum)
               case tree => loop(tail, accum :+ Weighted(w, tree))
             }
         }
@@ -269,8 +268,7 @@ object NameTree {
             }
           case Seq(Weighted(_, head), tail @ _*) =>
             eval(head) match {
-              case Fail => Fail
-              case Neg => loop(tail, accum)
+              case Fail | Neg => loop(tail, accum)
               case Leaf(value) => loop(tail, accum :+ value)
               case _ => scala.sys.error("bug")
             }
diff --git a/finagle-core/src/test/scala/com/twitter/finagle/NameTreeTest.scala b/finagle-core/src/test/scala/com/twitter/finagle/NameTreeTest.scala
index eae9df4ea6..8889e0088d 100644
--- a/finagle-core/src/test/scala/com/twitter/finagle/NameTreeTest.scala
+++ b/finagle-core/src/test/scala/com/twitter/finagle/NameTreeTest.scala
@@ -157,7 +157,8 @@ class NameTreeTest extends FunSuite {
       "~ | (~ | $) | /blah" -> Some(Set.empty),
       "(~|$|/foo) & (/bar|/blah) & ~ & /FOO" -> Some(Set("/bar", "/FOO")),
       "! | /ok" -> None,
-      "/ok & !" -> None,
+      "/ok & !" -> Some(Set("/ok")),
+      "! & ! & !" -> None,
       "~ | /ok | !" -> Some(Set("/ok"))
     )