diff --git a/src/__tests__/fixtures/simpleSchema.ts b/src/__tests__/fixtures/simpleSchema.ts
index 27784553..f63d048d 100644
--- a/src/__tests__/fixtures/simpleSchema.ts
+++ b/src/__tests__/fixtures/simpleSchema.ts
@@ -368,29 +368,10 @@ export type simpleSchema = {
       };
     };
 
-    ID: {
-      kind: 'SCALAR';
-      name: 'ID';
-      type: string;
-    };
-
-    String: {
-      kind: 'SCALAR';
-      name: 'String';
-      type: string;
-    };
-
-    Boolean: {
-      kind: 'SCALAR';
-      name: 'Boolean';
-      type: boolean;
-    };
-
-    Int: {
-      kind: 'SCALAR';
-      name: 'Int';
-      type: number;
-    };
+    ID: unknown;
+    String: unknown;
+    Boolean: unknown;
+    Int: unknown;
 
     Author: {
       kind: 'OBJECT';
diff --git a/src/__tests__/selection.test-d.ts b/src/__tests__/selection.test-d.ts
index 6810f10c..8d208e0f 100644
--- a/src/__tests__/selection.test-d.ts
+++ b/src/__tests__/selection.test-d.ts
@@ -12,7 +12,7 @@ import type {
   makeDefinitionDecoration,
 } from '../namespace';
 
-type schema = simpleSchema;
+type schema = addIntrospectionScalars<simpleSchema>;
 
 test('infers simple fields', () => {
   type query = parseDocument</* GraphQL */ `
diff --git a/src/__tests__/variables.test-d.ts b/src/__tests__/variables.test-d.ts
index 5f7fb256..5702f7b8 100644
--- a/src/__tests__/variables.test-d.ts
+++ b/src/__tests__/variables.test-d.ts
@@ -1,8 +1,11 @@
 import { describe, it, expectTypeOf } from 'vitest';
-import type { simpleSchema as schema } from './fixtures/simpleSchema';
+import type { simpleSchema } from './fixtures/simpleSchema';
+import type { addIntrospectionScalars } from '../introspection';
 import type { parseDocument } from '../parser';
 import type { getVariablesType, getScalarType } from '../variables';
 
+type schema = addIntrospectionScalars<simpleSchema>;
+
 describe('getVariablesType', () => {
   it('parses document-variables correctly', () => {
     const query = `