diff --git a/packages/eslint-plugin/src/rules/prefer-destructuring.ts b/packages/eslint-plugin/src/rules/prefer-destructuring.ts
index 5934573e3350..a3afb125a301 100644
--- a/packages/eslint-plugin/src/rules/prefer-destructuring.ts
+++ b/packages/eslint-plugin/src/rules/prefer-destructuring.ts
@@ -52,6 +52,7 @@ const schema: readonly JSONSchema4[] = [
   },
   {
     type: 'object',
+    additionalProperties: false,
     properties: {
       enforceForDeclarationWithTypeAnnotation: {
         type: 'boolean',
diff --git a/packages/eslint-plugin/src/rules/prefer-nullish-coalescing.ts b/packages/eslint-plugin/src/rules/prefer-nullish-coalescing.ts
index 3e8c5914fa9f..d611e7b079a9 100644
--- a/packages/eslint-plugin/src/rules/prefer-nullish-coalescing.ts
+++ b/packages/eslint-plugin/src/rules/prefer-nullish-coalescing.ts
@@ -123,6 +123,7 @@ export default createRule<Options, MessageIds>({
             oneOf: [
               {
                 type: 'object',
+                additionalProperties: false,
                 description: 'Which primitives types may be ignored.',
                 properties: {
                   bigint: {
diff --git a/packages/eslint-plugin/tests/schema-snapshots/prefer-destructuring.shot b/packages/eslint-plugin/tests/schema-snapshots/prefer-destructuring.shot
index 61036ced3fda..d99ed3d30301 100644
--- a/packages/eslint-plugin/tests/schema-snapshots/prefer-destructuring.shot
+++ b/packages/eslint-plugin/tests/schema-snapshots/prefer-destructuring.shot
@@ -49,6 +49,7 @@
     ]
   },
   {
+    "additionalProperties": false,
     "properties": {
       "enforceForDeclarationWithTypeAnnotation": {
         "description": "Whether to enforce destructuring on variable declarations with type annotations.",
@@ -88,6 +89,5 @@ type Options = [
     enforceForDeclarationWithTypeAnnotation?: boolean;
     /** Whether to enforce destructuring that use a different variable name than the property name. */
     enforceForRenamedProperties?: boolean;
-    [k: string]: unknown;
   },
 ];
diff --git a/packages/eslint-plugin/tests/schema-snapshots/prefer-nullish-coalescing.shot b/packages/eslint-plugin/tests/schema-snapshots/prefer-nullish-coalescing.shot
index 18b7da68ac53..5a8ea93c4ed6 100644
--- a/packages/eslint-plugin/tests/schema-snapshots/prefer-nullish-coalescing.shot
+++ b/packages/eslint-plugin/tests/schema-snapshots/prefer-nullish-coalescing.shot
@@ -29,6 +29,7 @@
         "description": "Whether to ignore all (`true`) or some (an object with properties) primitive types.",
         "oneOf": [
           {
+            "additionalProperties": false,
             "description": "Which primitives types may be ignored.",
             "properties": {
               "bigint": {
@@ -95,7 +96,6 @@ type Options = [
           number?: boolean;
           /** Ignore string primitive types. */
           string?: boolean;
-          [k: string]: unknown;
         }
       /** Ignore all primitive types. */
       | true;