diff --git a/xregexp/xregexp-tests.ts b/xregexp/xregexp-tests.ts
index 1f093cafa7..0a7f24dedd 100644
--- a/xregexp/xregexp-tests.ts
+++ b/xregexp/xregexp-tests.ts
@@ -10,6 +10,7 @@ var exp: RegExp;
 var expArr: RegExp[];
 var chain: RegExp[];
 var groupChain: { regex: RegExp; backref: string }[];
+var groupChain1: { regex: RegExp; backref: number }[];
 var regex: RegExp;
 var value: any;
 var str: string;
@@ -93,6 +94,7 @@ bool = XRegExp.isInstalled(str);
 bool = XRegExp.isRegExp(value);
 strArr = XRegExp.matchChain(str, chain);
 strArr = XRegExp.matchChain(str, groupChain);
+strArr = XRegExp.matchChain(str, groupChain1);
 
 // --  --  --  --  --  --  --  --  --  --  --  --  --
 
diff --git a/xregexp/xregexp.d.ts b/xregexp/xregexp.d.ts
index 886d242f04..561c37f574 100644
--- a/xregexp/xregexp.d.ts
+++ b/xregexp/xregexp.d.ts
@@ -42,6 +42,7 @@ declare module 'xregexp' {
 		function isRegExp(value: any): boolean;
 		function matchChain(str: string, chain: RegExp[]): string[];
 		function matchChain(str: string, chain: { regex: RegExp; backref: string }[]): string[];
+		function matchChain(str: string, chain: { regex: RegExp; backref: number }[]): string[];
 		function matchRecursive(str: string, left: string, right: string, flags?: string, options?: Object): string[];
 
 		function replace(str: string, search: string, replacement: string, scope?: string): string;