diff --git a/api/CSSMathNegate.json b/api/CSSMathNegate.json
index de7466135b81c9..e942d499e1e1bf 100644
--- a/api/CSSMathNegate.json
+++ b/api/CSSMathNegate.json
@@ -94,7 +94,7 @@
           }
         }
       },
-      "values": {
+      "value": {
         "__compat": {
           "support": {
             "chrome": {