diff --git a/lib/fake-server/index.js b/lib/fake-server/index.js
index 2523f7b..a189722 100644
--- a/lib/fake-server/index.js
+++ b/lib/fake-server/index.js
@@ -150,7 +150,6 @@ var fakeServer = {
             fakeHTTPMethods: true,
             logger: true,
             unsafeHeadersEnabled: true,
-            legacyRoutes: true,
         };
 
         // eslint-disable-next-line no-param-reassign
@@ -214,8 +213,6 @@ var fakeServer = {
 
     log: log,
 
-    legacyRoutes: true,
-
     respondWith: function respondWith(method, url, body) {
         if (arguments.length === 1 && typeof method !== "function") {
             this.response = responseArray(method);
@@ -255,13 +252,6 @@ var fakeServer = {
                 // eslint-disable-next-line no-param-reassign
                 url = url.replace(/\/\*/g, "/*path");
             }
-
-            if (this.legacyRoutes) {
-                if (url.includes("?")) {
-                    // eslint-disable-next-line no-param-reassign
-                    url = url.replace("?", "\\?");
-                }
-            }
         }
         push.call(this.responses, {
             method: method,
diff --git a/lib/fake-server/index.test.js b/lib/fake-server/index.test.js
index 21d8796..6db0937 100644
--- a/lib/fake-server/index.test.js
+++ b/lib/fake-server/index.test.js
@@ -108,16 +108,6 @@ describe("sinonFakeServer", function () {
                 "fakeServer.create should not accept 'foo' settings",
             );
         });
-
-        it("allows the 'legacyRoutes' setting", function () {
-            var server = sinonFakeServer.create({
-                legacyRoutes: false,
-            });
-            assert(
-                server.legacyRoutes === false,
-                "fakeServer.create should accept 'legacyRoutes' setting",
-            );
-        });
     });
 
     it("fakes XMLHttpRequest", function () {
@@ -913,9 +903,8 @@ describe("sinonFakeServer", function () {
             assert(handler.calledOnce);
         });
 
-        it("yields response to handler when url contains escaped RegExp characters in non-legacy mode", function () {
+        it("yields response to request function handler when url contains RegExp characters", function () {
             var handler = sinon.spy();
-            this.server.legacyRoutes = false;
             this.server.respondWith("GET", "/hello\\?world", handler);
             var xhr = new FakeXMLHttpRequest();
             xhr.open("GET", "/hello?world");
@@ -926,18 +915,6 @@ describe("sinonFakeServer", function () {
             assert(handler.calledOnce);
         });
 
-        it("yields response to handler when url contains unescaped RegExp characters in legacy mode", function () {
-            var handler = sinon.spy();
-            this.server.respondWith("GET", "/hello?world", handler);
-            var xhr = new FakeXMLHttpRequest();
-            xhr.open("GET", "/hello?world");
-            xhr.send();
-
-            this.server.respond();
-
-            assert(handler.calledOnce);
-        });
-
         function equalMatcher(expected) {
             return function (test) {
                 return expected === test;