diff --git a/mathml/elements/mtd.json b/mathml/elements/mtd.json
index 91c11a3d4821a3..c73f02eb1ca48a 100644
--- a/mathml/elements/mtd.json
+++ b/mathml/elements/mtd.json
@@ -27,7 +27,7 @@
               "version_added": false
             },
             "opera": {
-              "version_added": "9.5"
+              "version_added": false
             },
             "opera_android": {
               "version_added": false
@@ -73,7 +73,7 @@
                 "version_added": false
               },
               "opera": {
-                "version_added": "9.5"
+                "version_added": false
               },
               "opera_android": {
                 "version_added": false
@@ -261,7 +261,7 @@
                 "version_added": false
               },
               "opera": {
-                "version_added": "9.5"
+                "version_added": false
               },
               "opera_android": {
                 "version_added": false