diff --git a/modules/@angular/http/src/url_search_params.ts b/modules/@angular/http/src/url_search_params.ts
index 5f6ff87085..6bda7d0800 100644
--- a/modules/@angular/http/src/url_search_params.ts
+++ b/modules/@angular/http/src/url_search_params.ts
@@ -41,7 +41,7 @@ function standardEncoding(v: string): string {
       .replace(/%2C/gi, ',')
       .replace(/%3B/gi, ';')
       .replace(/%2B/gi, '+')
-      .replace(/%3D/gi, ';')
+      .replace(/%3D/gi, '=')
       .replace(/%3F/gi, '?')
       .replace(/%2F/gi, '/');
 }
diff --git a/modules/@angular/http/test/url_search_params_spec.ts b/modules/@angular/http/test/url_search_params_spec.ts
index 933318c151..237bee9a07 100644
--- a/modules/@angular/http/test/url_search_params_spec.ts
+++ b/modules/@angular/http/test/url_search_params_spec.ts
@@ -68,11 +68,11 @@ export function main() {
        **/
 
       let params = new URLSearchParams();
-      '! $ \' ( ) * + , ; A 9 - . _ ~ ? /'.split(' ').forEach(
+      '! $ \' ( ) * + , ; A 9 - . _ ~ ? / ='.split(' ').forEach(
           (char, idx) => { params.set(`a${idx}`, char); });
       expect(params.toString())
           .toBe(
-              `a0=!&a1=$&a2=\'&a3=(&a4=)&a5=*&a6=+&a7=,&a8=;&a9=A&a10=9&a11=-&a12=.&a13=_&a14=~&a15=?&a16=/`
+              `a0=!&a1=$&a2=\'&a3=(&a4=)&a5=*&a6=+&a7=,&a8=;&a9=A&a10=9&a11=-&a12=.&a13=_&a14=~&a15=?&a16=/&a17==`
                   .replace(/\s/g, ''));