diff --git a/lib/sinon/assert.js b/lib/sinon/assert.js
index 43a555804..374be4d8b 100644
--- a/lib/sinon/assert.js
+++ b/lib/sinon/assert.js
@@ -47,8 +47,6 @@ function createAssertObject(opts) {
     });
 
     const assert = {
-        failException: "AssertError",
-
         fail: function fail(message) {
             let msg = message;
             if (cleanedAssertOptions.shouldLimitAssertionLogs) {
@@ -58,7 +56,7 @@ function createAssertObject(opts) {
                 );
             }
             const error = new Error(msg);
-            error.name = this.failException || assert.failException;
+            error.name = "AssertError";
 
             throw error;
         },
diff --git a/test/assert-test.js b/test/assert-test.js
index 69b675017..101f439e1 100644
--- a/test/assert-test.js
+++ b/test/assert-test.js
@@ -57,14 +57,6 @@ describe("assert", function () {
     });
 
     describe(".fail", function () {
-        beforeEach(function () {
-            this.exceptionName = sinonAssert.failException;
-        });
-
-        afterEach(function () {
-            sinonAssert.failException = this.exceptionName;
-        });
-
         it("can be configured to limit the error message length", function () {
             const customAssert = sinonAssert.createAssertObject({
                 shouldLimitAssertionLogs: true,
@@ -87,17 +79,6 @@ describe("assert", function () {
                 },
             );
         });
-
-        it("throws configured exception type", function () {
-            sinonAssert.failException = "CustomError";
-
-            assert.exception(
-                function () {
-                    sinonAssert.fail("Some message");
-                },
-                { name: "CustomError" },
-            );
-        });
     });
 
     describe("with stubs", function () {
@@ -1352,7 +1333,6 @@ describe("assert", function () {
             sinonAssert.expose(test);
 
             assert.isFunction(test.fail);
-            assert.isString(test.failException);
             assert.isFunction(test.assertCalled);
             assert.isFunction(test.assertCalledOn);
             assert.isFunction(test.assertCalledWith);
@@ -1367,7 +1347,6 @@ describe("assert", function () {
                 includeFail: false,
             });
 
-            assert.equals(typeof failException, "undefined");
             /*eslint-disable no-undef*/
             assert.isFunction(assertCalled);
             assert.isFunction(assertCalledOn);
@@ -1401,7 +1380,6 @@ describe("assert", function () {
             sinonAssert.expose(test, { prefix: "" });
 
             assert.isFunction(test.fail);
-            assert.isString(test.failException);
             assert.isFunction(test.called);
             assert.isFunction(test.calledOn);
             assert.isFunction(test.calledWith);
diff --git a/test/sandbox-test.js b/test/sandbox-test.js
index 397b99718..4929c82c4 100644
--- a/test/sandbox-test.js
+++ b/test/sandbox-test.js
@@ -1965,31 +1965,4 @@ describe("Sandbox", function () {
             refute.equals(getter, spy.get);
         });
     });
-
-    describe(".assert", function () {
-        it("allows rebinding of .fail on a per-sandbox level", function () {
-            const sandboxA = createSandbox();
-            const sandboxB = createSandbox();
-
-            sandboxA.assert.failException = "CustomErrorA";
-            sandboxB.assert.failException = "CustomErrorB";
-
-            assert.exception(
-                function () {
-                    sandboxA.assert.fail("Some message");
-                },
-                { name: "CustomErrorA" },
-            );
-
-            assert.exception(
-                function () {
-                    sandboxB.assert.fail("Some message");
-                },
-                { name: "CustomErrorB" },
-            );
-
-            sandboxA.restore();
-            sandboxB.restore();
-        });
-    });
 });