diff --git a/js/customElements/image.js b/js/customElements/image.js
index 2fb626c..f8e2440 100644
--- a/js/customElements/image.js
+++ b/js/customElements/image.js
@@ -4,7 +4,7 @@ class CustomImage extends HTMLElement {
 
 
         var graphql = JSON.stringify({
-            query: "query($url: String) {imgproxy(url: $url)}",
+            query: "query($url: String!) {imgproxy(url: $url)}",
             variables: {
                 "url": originalURL
             }