diff --git a/js/customElements/image.js b/js/customElements/image.js
index 2fb626c779da5d34858630337ea1aa9f9560dd0f..f8e244049fd891d811f20200d669db23a50693a1 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
             }