diff --git a/src/main/scala/org/gerweck/scalafx/util/PropertyBuilder.scala b/src/main/scala/org/gerweck/scalafx/util/PropertyBuilder.scala
index 0bb5057..5ebeb46 100644
--- a/src/main/scala/org/gerweck/scalafx/util/PropertyBuilder.scala
+++ b/src/main/scala/org/gerweck/scalafx/util/PropertyBuilder.scala
@@ -15,7 +15,7 @@ import scalafx.beans.property._
   * @author Sarah Gerweck <sarah@atscale.com>
   */
 trait PropertyBuilder[A] {
-  type Prop <: Property[A, _]
+  type Prop <: SimpleProperty[A]
   def makeNew(default: A): Prop
 }
 
@@ -52,7 +52,7 @@ object PropertyBuilder extends PropertyBuilderLP {
     def makeNew(default: String) = StringProperty(default)
   }
 
-  def apply[A](default: A)(implicit builder: PropertyBuilder[A]): Property[A, _] = {
+  def apply[A](default: A)(implicit builder: PropertyBuilder[A]): SimpleProperty[A] = {
     builder.makeNew(default)
   }
 }
diff --git a/src/main/scala/org/gerweck/scalafx/util/package.scala b/src/main/scala/org/gerweck/scalafx/util/package.scala
index b2d65f5..0e2dc0f 100644
--- a/src/main/scala/org/gerweck/scalafx/util/package.scala
+++ b/src/main/scala/org/gerweck/scalafx/util/package.scala
@@ -19,6 +19,7 @@ import Scalaz._
   */
 package object util {
   type Observable[A] = ObservableValue[A, _]
+  type SimpleProperty[A] = Property[A, _]
 
   implicit val observableApplicative = new Applicative[Observable] {
     def point[A](a: => A): Observable[A] = {
@@ -48,7 +49,7 @@ package object util {
     }
   }
 
-  implicit class RichProperty[A](val inner: Property[A, _]) extends AnyVal {
+  implicit class RichProperty[A](val inner: SimpleProperty[A]) extends AnyVal {
     def biMap[B <: AnyRef](push: A => B, pull: B => A): ObjectProperty[B] = {
       val original = push(inner.value)
       val op = ObjectProperty[B](original)