diff --git a/packages-private/dts-test/setupHelpers.test-d.ts b/packages-private/dts-test/setupHelpers.test-d.ts
index aeab4f9b997..7b5d6f147f0 100644
--- a/packages-private/dts-test/setupHelpers.test-d.ts
+++ b/packages-private/dts-test/setupHelpers.test-d.ts
@@ -58,9 +58,6 @@ describe('defineProps w/ type declaration + withDefaults', <T extends
       bool?: boolean
       boolAndUndefined: boolean | undefined
       foo?: T
-      u:
-        | { type: 'button'; buttonType?: 'submit' }
-        | { type: 'link'; href: string }
     }>(),
     {
       number: 123,
@@ -91,13 +88,6 @@ describe('defineProps w/ type declaration + withDefaults', <T extends
 
   expectType<boolean>(res.bool)
   expectType<boolean>(res.boolAndUndefined)
-
-  if (res.u.type === 'button') {
-    expectType<'submit' | undefined>(res.u.buttonType)
-  }
-  if (res.u.type === 'link') {
-    expectType<string>(res.u.href)
-  }
 })
 
 describe('defineProps w/ union type declaration + withDefaults', () => {
@@ -250,6 +240,23 @@ describe('withDefaults w/ defineProp type is different from the defaults type',
   res1.value
 })
 
+describe('withDefaults w/ defineProp discriminate union type', () => {
+  const props = withDefaults(
+    defineProps<
+      { type: 'button'; buttonType?: 'submit' } | { type: 'link'; href: string }
+    >(),
+    {
+      type: 'button',
+    },
+  )
+  if (props.type === 'button') {
+    expectType<'submit' | undefined>(props.buttonType)
+  }
+  if (props.type === 'link') {
+    expectType<string>(props.href)
+  }
+})
+
 describe('defineProps w/ runtime declaration', () => {
   // runtime declaration
   const props = defineProps({