diff --git a/source/lib/config.ts b/source/lib/config.ts
index 78a8db85..fb6ba9df 100644
--- a/source/lib/config.ts
+++ b/source/lib/config.ts
@@ -39,7 +39,8 @@ export default (pkg: {tsd?: RawConfig}, cwd: string): Config => {
 			target: ScriptTarget.ES2017,
 			...tsConfigCompilerOptions,
 			...packageJsonCompilerOptions,
-			moduleResolution: ModuleResolutionKind.NodeJs
+			moduleResolution: ModuleResolutionKind.NodeJs,
+			skipLibCheck: false
 		}
 	};
 };
diff --git a/source/test/fixtures/missing-import/index.d.ts b/source/test/fixtures/missing-import/index.d.ts
new file mode 100644
index 00000000..d426396f
--- /dev/null
+++ b/source/test/fixtures/missing-import/index.d.ts
@@ -0,0 +1,4 @@
+export type LiteralUnion<
+	LiteralType extends BaseType,
+	BaseType extends Primitive
+> = LiteralType | (BaseType & {_?: never});
diff --git a/source/test/fixtures/missing-import/index.js b/source/test/fixtures/missing-import/index.js
new file mode 100644
index 00000000..bc010a3d
--- /dev/null
+++ b/source/test/fixtures/missing-import/index.js
@@ -0,0 +1 @@
+// Nothing here
diff --git a/source/test/fixtures/missing-import/index.test-d.ts b/source/test/fixtures/missing-import/index.test-d.ts
new file mode 100644
index 00000000..362c4616
--- /dev/null
+++ b/source/test/fixtures/missing-import/index.test-d.ts
@@ -0,0 +1,8 @@
+import {expectType} from '../../..';
+import {LiteralUnion} from '.';
+
+type Pet = LiteralUnion<'dog' | 'cat', string>;
+
+expectType<Pet>('dog');
+expectType<Pet>('cat');
+expectType<Pet>('unicorn');
diff --git a/source/test/fixtures/missing-import/package.json b/source/test/fixtures/missing-import/package.json
new file mode 100644
index 00000000..de6dc1db
--- /dev/null
+++ b/source/test/fixtures/missing-import/package.json
@@ -0,0 +1,3 @@
+{
+	"name": "foo"
+}
diff --git a/source/test/test.ts b/source/test/test.ts
index 60b92f55..f9f164d6 100644
--- a/source/test/test.ts
+++ b/source/test/test.ts
@@ -233,3 +233,14 @@ test('expectError for values', async t => {
 	t.true(diagnostics[0].message === 'Expected an error, but found none.');
 	t.true(diagnostics[0].severity === 'error');
 });
+
+test('missing import', async t => {
+	const diagnostics = await m({cwd: path.join(__dirname, 'fixtures/missing-import')});
+
+	t.true(diagnostics.length === 1);
+
+	t.true(diagnostics[0].column === 18);
+	t.true(diagnostics[0].line === 3);
+	t.true(diagnostics[0].message === 'Cannot find name \'Primitive\'.');
+	t.true(diagnostics[0].severity === 'error');
+});