diff --git a/test-d/stdio/option/web-transform-instance.test-d.ts b/test-d/stdio/option/web-transform-instance.test-d.ts
index 937c2c4a3c..f3cdc2986a 100644
--- a/test-d/stdio/option/web-transform-instance.test-d.ts
+++ b/test-d/stdio/option/web-transform-instance.test-d.ts
@@ -1,3 +1,4 @@
+import {TransformStream} from 'node:stream/web';
 import {expectError, expectAssignable, expectNotAssignable} from 'tsd';
 import {
 	execa,
diff --git a/test-d/stdio/option/web-transform-invalid.test-d.ts b/test-d/stdio/option/web-transform-invalid.test-d.ts
index 62f9f33b56..d9d4835ea3 100644
--- a/test-d/stdio/option/web-transform-invalid.test-d.ts
+++ b/test-d/stdio/option/web-transform-invalid.test-d.ts
@@ -1,3 +1,4 @@
+import {TransformStream} from 'node:stream/web';
 import {expectError, expectNotAssignable} from 'tsd';
 import {
 	execa,
diff --git a/test-d/stdio/option/web-transform-object.test-d.ts b/test-d/stdio/option/web-transform-object.test-d.ts
index d6ccf35421..094840e95d 100644
--- a/test-d/stdio/option/web-transform-object.test-d.ts
+++ b/test-d/stdio/option/web-transform-object.test-d.ts
@@ -1,3 +1,4 @@
+import {TransformStream} from 'node:stream/web';
 import {expectError, expectAssignable, expectNotAssignable} from 'tsd';
 import {
 	execa,
diff --git a/test-d/stdio/option/web-transform.test-d.ts b/test-d/stdio/option/web-transform.test-d.ts
index 77d3acde1d..c4823e60cc 100644
--- a/test-d/stdio/option/web-transform.test-d.ts
+++ b/test-d/stdio/option/web-transform.test-d.ts
@@ -1,3 +1,4 @@
+import {TransformStream} from 'node:stream/web';
 import {expectError, expectAssignable, expectNotAssignable} from 'tsd';
 import {
 	execa,
diff --git a/test-d/transform/object-mode.test-d.ts b/test-d/transform/object-mode.test-d.ts
index b6542e594b..bc47901f17 100644
--- a/test-d/transform/object-mode.test-d.ts
+++ b/test-d/transform/object-mode.test-d.ts
@@ -1,4 +1,5 @@
 import {Duplex} from 'node:stream';
+import {TransformStream} from 'node:stream/web';
 import {expectType} from 'tsd';
 import {execa, type ExecaError} from '../../index.js';
 
diff --git a/types/stdio/type.d.ts b/types/stdio/type.d.ts
index ca1d0f1e03..452361ba18 100644
--- a/types/stdio/type.d.ts
+++ b/types/stdio/type.d.ts
@@ -1,5 +1,5 @@
 import type {Readable, Writable} from 'node:stream';
-import type {ReadableStream, WritableStream} from 'node:stream/web';
+import type {ReadableStream, WritableStream, TransformStream} from 'node:stream/web';
 import type {
 	Not,
 	And,
diff --git a/types/transform/normalize.d.ts b/types/transform/normalize.d.ts
index 491bf869b1..89a3348fae 100644
--- a/types/transform/normalize.d.ts
+++ b/types/transform/normalize.d.ts
@@ -1,3 +1,4 @@
+import type {TransformStream} from 'node:stream/web';
 import type {Duplex} from 'node:stream';
 import type {Unless} from '../utils.js';