diff --git a/lib/app-plus/view-api.js b/lib/app-plus/view-api.js
index a1b0a13c3cc039fc97919793daf342cbdcd9098f..67f1fcb7268cab4160e0ea2b5154d73db84601d5 100644
--- a/lib/app-plus/view-api.js
+++ b/lib/app-plus/view-api.js
@@ -12,7 +12,7 @@ export {
 
 export function canIUse (schema) {
   if (schema === 'css.var') {
-    return window.CSS && window.CSS.supports && window.CSS.supports('--a', 0)
+    return window.CSS && window.CSS.supports && window.CSS.supports('--a:0')
   }
   return true
-}
+}