diff --git a/tests/draft2019-09/optional/refOfUnknownKeyword.json b/tests/draft2019-09/optional/refOfUnknownKeyword.json
index 2db52308..a2437d31 100644
--- a/tests/draft2019-09/optional/refOfUnknownKeyword.json
+++ b/tests/draft2019-09/optional/refOfUnknownKeyword.json
@@ -69,7 +69,6 @@
         "description": "reference internals of known non-applicator",
         "schema": {
             "$schema": "https://json-schema.org/draft/2019-09/schema",
-            "$id": "/base",
             "examples": [
               { "type": "string" }
             ],
diff --git a/tests/draft2020-12/optional/refOfUnknownKeyword.json b/tests/draft2020-12/optional/refOfUnknownKeyword.json
index 8276affe..ab1510da 100644
--- a/tests/draft2020-12/optional/refOfUnknownKeyword.json
+++ b/tests/draft2020-12/optional/refOfUnknownKeyword.json
@@ -69,7 +69,6 @@
         "description": "reference internals of known non-applicator",
         "schema": {
             "$schema": "https://json-schema.org/draft/2020-12/schema",
-            "$id": "/base",
             "examples": [
               { "type": "string" }
             ],
diff --git a/tests/v1/optional/refOfUnknownKeyword.json b/tests/v1/optional/refOfUnknownKeyword.json
index 983a081c..8b3158e7 100644
--- a/tests/v1/optional/refOfUnknownKeyword.json
+++ b/tests/v1/optional/refOfUnknownKeyword.json
@@ -69,7 +69,6 @@
         "description": "reference internals of known non-applicator",
         "schema": {
             "$schema": "https://json-schema.org/v1",
-            "$id": "/base",
             "examples": [
               { "type": "string" }
             ],