diff --git a/internal/util-collection/src/main/scala/sbt/util/OptJsonWriter.scala b/internal/util-collection/src/main/scala/sbt/util/OptJsonWriter.scala
index 3a2a23f25..b7a793b46 100644
--- a/internal/util-collection/src/main/scala/sbt/util/OptJsonWriter.scala
+++ b/internal/util-collection/src/main/scala/sbt/util/OptJsonWriter.scala
@@ -11,4 +11,12 @@ trait OptJsonWriter0 {
 }
 object OptJsonWriter extends OptJsonWriter0 {
   implicit def lift[A](implicit z: JsonWriter[A]): SomeJsonWriter[A] = SomeJsonWriter(z)
+
+  trait OptOut0 {
+    implicit def conflictingFallback1[A]: NoJsonWriter[A] = NoJsonWriter()
+    implicit def conflictingFallback2[A]: NoJsonWriter[A] = NoJsonWriter()
+  }
+  object OptOut extends OptOut0 {
+    implicit def lift[A](implicit z: JsonWriter[A]): SomeJsonWriter[A] = SomeJsonWriter(z)
+  }
 }