diff --git a/src/lib/template/dom-repeat.html b/src/lib/template/dom-repeat.html
index 8082469384..6490b4d0a6 100644
--- a/src/lib/template/dom-repeat.html
+++ b/src/lib/template/dom-repeat.html
@@ -217,6 +217,7 @@
       },
 
       _targetFrameTime: {
+        type: Number,
         computed: '_computeFrameTime(targetFramerate)'
       }