diff --git a/files/jsondata/InterfaceData.json b/files/jsondata/InterfaceData.json
index 06ca0d6d11de3cf..51646bdcbcc2629 100644
--- a/files/jsondata/InterfaceData.json
+++ b/files/jsondata/InterfaceData.json
@@ -3136,14 +3136,6 @@
       "inh": "EventTarget",
       "impl": []
     },
-    "SpeechGrammar": {
-      "inh": "",
-      "impl": []
-    },
-    "SpeechGrammarList": {
-      "inh": "",
-      "impl": []
-    },
     "SpeechRecognition": {
       "inh": "EventTarget",
       "impl": []