diff --git a/compiler/ast/CustomTag.js b/compiler/ast/CustomTag.js
index c8f3ab85e..459cf2a04 100644
--- a/compiler/ast/CustomTag.js
+++ b/compiler/ast/CustomTag.js
@@ -70,6 +70,10 @@ function buildInputProps(el, context) {
             return; // Skip over attributes that are not supported
         }
 
+        if (attrValue == null) {
+            attrValue = context.builder.literalTrue();
+        }
+
         var propName;
         var parentPropName;