diff --git a/modules/@angular/router/CHANGELOG.md b/modules/@angular/router/CHANGELOG.md
index e52f92a16c..b9a0113b50 100644
--- a/modules/@angular/router/CHANGELOG.md
+++ b/modules/@angular/router/CHANGELOG.md
@@ -7,6 +7,7 @@
 
 ## Bug Fixes
 * fix(router): stringify positional parameters when using routerLink
+* fix(router): change serialize not to require parenthesis in query string to be encoded
 
 ## Breaking Changes
 
diff --git a/modules/@angular/router/src/url_serializer.ts b/modules/@angular/router/src/url_serializer.ts
index c5c8958667..b6502760e5 100644
--- a/modules/@angular/router/src/url_serializer.ts
+++ b/modules/@angular/router/src/url_serializer.ts
@@ -115,11 +115,18 @@ function pairs<T>(obj: {[key: string]: T}): Pair<string, T>[] {
 const SEGMENT_RE = /^[^\/\(\)\?;=&#]+/;
 function matchPathWithParams(str: string): string {
   SEGMENT_RE.lastIndex = 0;
-  var match = SEGMENT_RE.exec(str);
+  const match = SEGMENT_RE.exec(str);
   return match ? match[0] : '';
 }
 
-const QUERY_PARAM_VALUE_RE = /^[^\(\)\?;&#]+/;
+const QUERY_PARAM_RE = /^[^=\?&#]+/;
+function matchQueryParams(str: string): string {
+  QUERY_PARAM_RE.lastIndex = 0;
+  const match = SEGMENT_RE.exec(str);
+  return match ? match[0] : '';
+}
+
+const QUERY_PARAM_VALUE_RE = /^[^\?&#]+/;
 function matchUrlQueryParamValue(str: string): string {
   QUERY_PARAM_VALUE_RE.lastIndex = 0;
   const match = QUERY_PARAM_VALUE_RE.exec(str);
@@ -188,7 +195,7 @@ class UrlParser {
   }
 
   parseQueryParams(): {[key: string]: any} {
-    var params: {[key: string]: any} = {};
+    const params: {[key: string]: any} = {};
     if (this.peekStartsWith('?')) {
       this.capture('?');
       this.parseQueryParam(params);
@@ -209,7 +216,7 @@ class UrlParser {
   }
 
   parseMatrixParams(): {[key: string]: any} {
-    var params: {[key: string]: any} = {};
+    const params: {[key: string]: any} = {};
     while (this.remaining.length > 0 && this.peekStartsWith(';')) {
       this.capture(';');
       this.parseParam(params);
@@ -218,15 +225,15 @@ class UrlParser {
   }
 
   parseParam(params: {[key: string]: any}): void {
-    var key = matchPathWithParams(this.remaining);
+    const key = matchPathWithParams(this.remaining);
     if (!key) {
       return;
     }
     this.capture(key);
-    var value: any = 'true';
+    let value: any = 'true';
     if (this.peekStartsWith('=')) {
       this.capture('=');
-      var valueMatch = matchPathWithParams(this.remaining);
+      const valueMatch = matchPathWithParams(this.remaining);
       if (valueMatch) {
         value = valueMatch;
         this.capture(value);
@@ -237,12 +244,12 @@ class UrlParser {
   }
 
   parseQueryParam(params: {[key: string]: any}): void {
-    var key = matchPathWithParams(this.remaining);
+    const key = matchQueryParams(this.remaining);
     if (!key) {
       return;
     }
     this.capture(key);
-    var value: any = 'true';
+    let value: any = 'true';
     if (this.peekStartsWith('=')) {
       this.capture('=');
       var valueMatch = matchUrlQueryParamValue(this.remaining);
diff --git a/modules/@angular/router/test/url_serializer.spec.ts b/modules/@angular/router/test/url_serializer.spec.ts
index 6b780123c5..804212f471 100644
--- a/modules/@angular/router/test/url_serializer.spec.ts
+++ b/modules/@angular/router/test/url_serializer.spec.ts
@@ -92,6 +92,11 @@ describe('url serializer', () => {
     expect(tree.queryParams).toEqual({a: '1', b: '2'});
   });
 
+  it("should parse query params when with parenthesis", () => {
+    const tree = url.parse("/one?a=(11)&b=(22)");
+    expect(tree.queryParams).toEqual({a: '(11)', b: '(22)'});
+  });
+
   it("should parse key only query params", () => {
     const tree = url.parse("/one?a");
     expect(tree.queryParams).toEqual({a: 'true'});