diff --git a/packages/vite/src/node/ssr/__tests__/ssrTransform.spec.ts b/packages/vite/src/node/ssr/__tests__/ssrTransform.spec.ts
index a25336b425657d..f91444b49636a1 100644
--- a/packages/vite/src/node/ssr/__tests__/ssrTransform.spec.ts
+++ b/packages/vite/src/node/ssr/__tests__/ssrTransform.spec.ts
@@ -231,6 +231,20 @@ test('rewrite variable in string interpolation in function nested arguments', as
   expect(result.deps).toEqual(['vue'])
 })
 
+// #6520
+test('rewrite variables in default value of destructuring params', async () => {
+  const result = await ssrTransform(
+    `import { fn } from 'vue';function A({foo = fn}){ return {}; }`,
+    null,
+    null
+  )
+  expect(result.code).toMatchInlineSnapshot(`
+    "const __vite_ssr_import_0__ = await __vite_ssr_import__(\\"vue\\");
+    function A({foo = __vite_ssr_import_0__.fn}){ return {}; }"
+  `)
+  expect(result.deps).toEqual(['vue'])
+})
+
 test('do not rewrite when function declaration is in scope', async () => {
   const result = await ssrTransform(
     `import { fn } from 'vue';function A(){ function fn() {}; return { fn }; }`,
diff --git a/packages/vite/src/node/ssr/ssrTransform.ts b/packages/vite/src/node/ssr/ssrTransform.ts
index 63bbada1ab1ecd..c27804e87299e1 100644
--- a/packages/vite/src/node/ssr/ssrTransform.ts
+++ b/packages/vite/src/node/ssr/ssrTransform.ts
@@ -350,14 +350,19 @@ function walk(
           }
           ;(eswalk as any)(p.type === 'AssignmentPattern' ? p.left : p, {
             enter(child: Node, parent: Node) {
+              // skip params default value of destructure
+              if (
+                parent?.type === 'AssignmentPattern' &&
+                parent?.right === child
+              ) {
+                return this.skip()
+              }
               if (child.type !== 'Identifier') return
               // do not record as scope variable if is a destructuring keyword
               if (isStaticPropertyKey(child, parent)) return
               // do not record if this is a default value
               // assignment of a destructuring variable
               if (
-                (parent?.type === 'AssignmentPattern' &&
-                  parent?.right === child) ||
                 (parent?.type === 'TemplateLiteral' &&
                   parent?.expressions.includes(child)) ||
                 (parent?.type === 'CallExpression' && parent?.callee === child)