diff --git a/packages/utils/src/source-map.ts b/packages/utils/src/source-map.ts
index 738a13cf3f0f..65a5be8bf4b4 100644
--- a/packages/utils/src/source-map.ts
+++ b/packages/utils/src/source-map.ts
@@ -232,13 +232,14 @@ export function parseStacktrace(
     ? parseFFOrSafariStackTrace(stack)
     : parseV8Stacktrace(stack)
 
-  // remove assertion helper's internal stacks
+  // remove vi.defineHelper's internal stacks
   const helperIndex = stacks.findLastIndex(s =>
-    s.method === '__VITEST_HELPER__'
-    // firefox
-    || s.method === 'async*__VITEST_HELPER__'
-    // webkit
-    || s.method === 'async __VITEST_HELPER__',
+    // this covers cases such as
+    //   "__VITEST_HELPER__"
+    //   "__VITEST_HELPER__ [as <object method name>]"
+    //   "async*__VITEST_HELPER__" (firefox)
+    //   "async __VITEST_HELPER__" (webkit)
+    s.method.includes('__VITEST_HELPER__'),
   )
   if (helperIndex >= 0) {
     stacks = stacks.slice(helperIndex + 1)
diff --git a/packages/vitest/src/integrations/vi.ts b/packages/vitest/src/integrations/vi.ts
index 4b1822223f5a..f8d94f99ec2e 100644
--- a/packages/vitest/src/integrations/vi.ts
+++ b/packages/vitest/src/integrations/vi.ts
@@ -612,8 +612,8 @@ function createVitest(): VitestUtils {
     waitFor,
     waitUntil,
     defineHelper: (fn) => {
-      return function __VITEST_HELPER__(...args: any[]): any {
-        const result = fn(...args)
+      return function __VITEST_HELPER__(this: any, ...args: any[]): any {
+        const result = fn.apply(this, args)
         if (result && typeof result === 'object' && typeof result.then === 'function') {
           return (async function __VITEST_HELPER__() {
             return await result
diff --git a/test/cli/fixtures/assertion-helper/basic.test.ts b/test/cli/fixtures/assertion-helper/basic.test.ts
index 8431f6ff1fbf..e8df6c7a56da 100644
--- a/test/cli/fixtures/assertion-helper/basic.test.ts
+++ b/test/cli/fixtures/assertion-helper/basic.test.ts
@@ -104,3 +104,30 @@ const myHelperWithLogs = vi.defineHelper(() => {
 test("helper with logs", () => {
   myHelperWithLogs();
 });
+
+const helperObject = {
+  prop: 1234,
+  assertEqualProp: vi.defineHelper(function (this: any, actual: any) {
+    expect(actual).toEqual(this.prop);
+  }),
+  assertEqualPropAsync: vi.defineHelper(async function (this: any, actual: any) {
+    await new Promise((r) => setTimeout(r, 1));
+    expect(actual).toEqual(this.prop);
+  }),
+}
+
+test("helper with context pass", () => {
+  helperObject.assertEqualProp(1234);
+});
+
+test("helper with context fail", () => {
+  helperObject.assertEqualProp(4321);
+});
+
+test("async helper with context pass", async () => {
+  await helperObject.assertEqualPropAsync(1234);
+});
+
+test("async helper with context fail", async () => {
+  await helperObject.assertEqualPropAsync(4321);
+});
diff --git a/test/cli/test/assertion-helper.test.ts b/test/cli/test/assertion-helper.test.ts
index 315d1ad0fec7..9615c4d7ac27 100644
--- a/test/cli/test/assertion-helper.test.ts
+++ b/test/cli/test/assertion-helper.test.ts
@@ -13,7 +13,7 @@ it('assertion helper', async () => {
      ❯ basic.test.ts:105:3
 
 
-    ⎯⎯⎯⎯⎯⎯⎯ Failed Tests 8 ⎯⎯⎯⎯⎯⎯⎯
+    ⎯⎯⎯⎯⎯⎯ Failed Tests 10 ⎯⎯⎯⎯⎯⎯⎯
 
      FAIL  basic.test.ts > sync
     AssertionError: expected 'sync' to deeply equal 'x'
@@ -29,7 +29,7 @@ it('assertion helper', async () => {
          23| });
          24|
 
-    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[1/9]⎯
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[1/11]⎯
 
      FAIL  basic.test.ts > async
     AssertionError: expected 'async' to deeply equal 'x'
@@ -45,7 +45,7 @@ it('assertion helper', async () => {
          27| });
          28|
 
-    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[2/9]⎯
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[2/11]⎯
 
      FAIL  basic.test.ts > soft
     AssertionError: expected 'soft' to deeply equal 'x'
@@ -61,7 +61,7 @@ it('assertion helper', async () => {
          31| });
          32|
 
-    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[3/9]⎯
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[3/11]⎯
 
      FAIL  basic.test.ts > soft async
     AssertionError: expected 'soft async' to deeply equal 'x'
@@ -77,7 +77,7 @@ it('assertion helper', async () => {
          35| });
          36|
 
-    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[4/9]⎯
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[4/11]⎯
 
      FAIL  basic.test.ts > nested
     AssertionError: expected 'nested' to deeply equal 'x'
@@ -93,7 +93,7 @@ it('assertion helper', async () => {
          47| });
          48|
 
-    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[5/9]⎯
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[5/11]⎯
 
      FAIL  basic.test.ts > multiple soft
     AssertionError: expected 'first' to deeply equal 'x'
@@ -109,7 +109,7 @@ it('assertion helper', async () => {
          78|   myEqualSoft("second", "y");
          79| });
 
-    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[6/9]⎯
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[6/11]⎯
 
      FAIL  basic.test.ts > multiple soft
     AssertionError: expected 'second' to deeply equal 'y'
@@ -125,7 +125,7 @@ it('assertion helper', async () => {
          79| });
          80|
 
-    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[7/9]⎯
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[7/11]⎯
 
      FAIL  basic.test.ts > custom error
     Error: custom error from helper
@@ -137,7 +137,7 @@ it('assertion helper', async () => {
          88| });
          89|
 
-    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[8/9]⎯
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[8/11]⎯
 
      FAIL  basic.test.ts > non-helper wrapper
     AssertionError: expected 'wrapper' to deeply equal 'x'
@@ -154,7 +154,45 @@ it('assertion helper', async () => {
          94|
      ❯ basic.test.ts:96:3
 
-    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[9/9]⎯
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[9/11]⎯
+
+     FAIL  basic.test.ts > helper with context fail
+    AssertionError: expected 4321 to deeply equal 1234
+
+    - Expected
+    + Received
+
+    - 1234
+    + 4321
+
+     ❯ basic.test.ts:124:16
+        122|
+        123| test("helper with context fail", () => {
+        124|   helperObject.assertEqualProp(4321);
+           |                ^
+        125| });
+        126|
+
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[10/11]⎯
+
+     FAIL  basic.test.ts > async helper with context fail
+    AssertionError: expected 4321 to deeply equal 1234
+
+    - Expected
+    + Received
+
+    - 1234
+    + 4321
+
+     ❯ basic.test.ts:132:3
+        130|
+        131| test("async helper with context fail", async () => {
+        132|   await helperObject.assertEqualPropAsync(4321);
+           |   ^
+        133| });
+        134|
+
+    ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[11/11]⎯
 
     "
   `)
@@ -164,9 +202,17 @@ it('assertion helper', async () => {
         "async": [
           "expected 'async' to deeply equal 'x'",
         ],
+        "async helper with context fail": [
+          "expected 4321 to deeply equal 1234",
+        ],
+        "async helper with context pass": "passed",
         "custom error": [
           "custom error from helper",
         ],
+        "helper with context fail": [
+          "expected 4321 to deeply equal 1234",
+        ],
+        "helper with context pass": "passed",
         "helper with logs": "passed",
         "multiple soft": [
           "expected 'first' to deeply equal 'x'",