diff --git a/packages/vitest/src/node/error.ts b/packages/vitest/src/node/error.ts
index 2da1c1943ecf..a21cf45d1acf 100644
--- a/packages/vitest/src/node/error.ts
+++ b/packages/vitest/src/node/error.ts
@@ -111,6 +111,7 @@ const skipErrorProperties = new Set([
   'stackStr',
   'type',
   'showDiff',
+  'diff',
   'actual',
   'expected',
   'VITEST_TEST_NAME',