diff --git a/packages/vitest/src/integrations/chai/jest-matcher-utils.ts b/packages/vitest/src/integrations/chai/jest-matcher-utils.ts
index 6431ebec4..671d49d60 100644
--- a/packages/vitest/src/integrations/chai/jest-matcher-utils.ts
+++ b/packages/vitest/src/integrations/chai/jest-matcher-utils.ts
@@ -113,7 +113,7 @@ const SPACE_SYMBOL = '\u{00B7}' // middle dot
 const replaceTrailingSpaces = (text: string): string =>
   text.replace(/\s+$/gm, spaces => SPACE_SYMBOL.repeat(spaces.length))
 
-export const stringify = (object: unknown, maxDepth = 10, options?: PrettyFormatOptions): string => {
+export function stringify(object: unknown, maxDepth = 10, options?: PrettyFormatOptions): string {
   const MAX_LENGTH = 10000
   let result
 
diff --git a/packages/vitest/src/node/error.ts b/packages/vitest/src/node/error.ts
index 4bfd464fe..999a61f2f 100644
--- a/packages/vitest/src/node/error.ts
+++ b/packages/vitest/src/node/error.ts
@@ -7,6 +7,7 @@ import cliTruncate from 'cli-truncate'
 import type { ErrorWithDiff, ParsedStack, Position } from '../types'
 import { interpretSourcePos, lineSplitRE, parseStacktrace, posToNumber } from '../utils/source-map'
 import { F_POINTER } from '../utils/figures'
+import { stringify } from '../integrations/chai/jest-matcher-utils'
 import type { Vitest } from './core'
 import { unifiedDiff } from './diff'
 
@@ -46,7 +47,7 @@ export async function printError(error: unknown, ctx: Vitest) {
   handleImportOutsideModuleError(e.stack || e.stackStr || '', ctx)
 
   if (e.showDiff)
-    displayDiff(e.actual, e.expected, ctx.console, ctx.config.outputTruncateLength)
+    displayDiff(stringify(e.actual), stringify(e.expected), ctx.console, ctx.config.outputTruncateLength)
 }
 
 const esmErrors = [