diff --git a/xregexp/xregexp-tests.ts b/xregexp/xregexp-tests.ts
index 62d37439ef..1f093cafa7 100644
--- a/xregexp/xregexp-tests.ts
+++ b/xregexp/xregexp-tests.ts
@@ -9,6 +9,7 @@ import TokenOpts = X.TokenOpts;
 var exp: RegExp;
 var expArr: RegExp[];
 var chain: RegExp[];
+var groupChain: { regex: RegExp; backref: string }[];
 var regex: RegExp;
 var value: any;
 var str: string;
@@ -91,6 +92,7 @@ XRegExp.install(obj);
 bool = XRegExp.isInstalled(str);
 bool = XRegExp.isRegExp(value);
 strArr = XRegExp.matchChain(str, chain);
+strArr = XRegExp.matchChain(str, groupChain);
 
 // --  --  --  --  --  --  --  --  --  --  --  --  --
 
diff --git a/xregexp/xregexp.d.ts b/xregexp/xregexp.d.ts
index 9e30a2d077..886d242f04 100644
--- a/xregexp/xregexp.d.ts
+++ b/xregexp/xregexp.d.ts
@@ -41,6 +41,7 @@ declare module 'xregexp' {
 		function isInstalled(feature: string): boolean;
 		function isRegExp(value: any): boolean;
 		function matchChain(str: string, chain: RegExp[]): string[];
+		function matchChain(str: string, chain: { regex: RegExp; backref: string }[]): 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;