diff --git a/index.d.ts b/index.d.ts
index 514653d..1fc7df5 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -9,6 +9,7 @@ declare module NpmtsPlugins {
             sequence: any;
             typescript: any;
         };
+        mathjs: any;
         mergeStream: any;
         mocha: any;
         path: any;
@@ -46,6 +47,7 @@ declare var plugins: {
         sequence: any;
         typescript: any;
     };
+    mathjs: any;
     mergeStream: any;
     mocha: any;
     path: any;
diff --git a/index.js b/index.js
index 087e010..66dad2a 100644
--- a/index.js
+++ b/index.js
@@ -13,6 +13,7 @@ var NpmtsPlugins;
                 sequence: require("gulp-sequence"),
                 typescript: require("gulp-typescript")
             },
+            mathjs: require("mathjs"),
             mergeStream: require("merge2"),
             mocha: require("mocha"),
             path: require("path"),
@@ -84,19 +85,28 @@ var NpmtsCustom;
              * ----------- first install typings ---------------
              * ----------------------------------------------- */
             var typingsDone = plugins.q.defer();
-            var checkTypingsDone = function (indexArg, compareArray) {
-                if ((indexArg + 1) == compareArray.length) {
+            var typingsCounter = 0;
+            var typingsCounterAdvance = function () {
+                typingsCounter++;
+                if (typeof config.typings[typingsCounter] != "undefined") {
+                    installTypings();
+                }
+                else {
                     plugins.beautylog.success("custom typings installed successfully");
                     typingsDone.resolve();
                 }
             };
-            for (var key in config.typings) {
-                plugins.beautylog.log("now installing " + "typings.json".yellow + " from " + config.typings[key].blue);
-                plugins.typings.install({ production: false, cwd: plugins.path.join(paths.cwd, config.typings[key]) })
+            var installTypings = function () {
+                plugins.beautylog.log("now installing " + "typings.json".yellow + " from " + config.typings[typingsCounter].blue);
+                plugins.typings.install({ production: false, cwd: plugins.path.join(paths.cwd, config.typings[typingsCounter]) })
                     .then(function () {
-                    checkTypingsDone(key, config.typings);
+                    typingsCounterAdvance();
+                }, function () {
+                    plugins.beautylog.error("something went wrong: Check if path is correct: " + config.typings[typingsCounter].blue);
+                    typingsCounterAdvance();
                 });
-            }
+            };
+            installTypings();
             /* -------------------------------------------------
              * ----------- second compile TS -------------------
              * ----------------------------------------------- */
diff --git a/package.json b/package.json
index 89489c5..c560d5a 100644
--- a/package.json
+++ b/package.json
@@ -33,6 +33,7 @@
     "gulp-sequence": "^0.4.4",
     "gulp-typescript": "2.10.0",
     "gulp-typings": "0.0.0",
+    "mathjs": "^2.7.0",
     "merge2": "1.0.1",
     "mocha": "^2.4.5",
     "q": "^1.4.1",
diff --git a/test/assets/npmts.json b/test/assets/npmts.json
index 6d24eef..04fe295 100644
--- a/test/assets/npmts.json
+++ b/test/assets/npmts.json
@@ -4,6 +4,9 @@
     "./customdir/*.ts":"./"
   },
   "typings":[
+    "./ts",
+    "./subts1/",
+    "./subts2/",
     "./customdir"
   ]
 }
\ No newline at end of file
diff --git a/test/assets/subts1/typings.json b/test/assets/subts1/typings.json
new file mode 100644
index 0000000..fd6d68d
--- /dev/null
+++ b/test/assets/subts1/typings.json
@@ -0,0 +1,7 @@
+{
+  "ambientDependencies": {
+    "node": "github:DefinitelyTyped/DefinitelyTyped/node/node.d.ts#78d36dd49b6b55b9fdfe61776a12bf05c8b07777",
+    "colors": "github:DefinitelyTyped/DefinitelyTyped/colors/colors.d.ts#09e37435ffb2c56a6f908081194a74756f24f99d",
+    "vinyl": "github:DefinitelyTyped/DefinitelyTyped/vinyl/vinyl.d.ts#78d36dd49b6b55b9fdfe61776a12bf05c8b07777"
+  }
+}
diff --git a/ts/npmts.custom.ts b/ts/npmts.custom.ts
index df17be0..697fc13 100644
--- a/ts/npmts.custom.ts
+++ b/ts/npmts.custom.ts
@@ -10,19 +10,27 @@ module NpmtsCustom {
              * ----------- first install typings ---------------
              * ----------------------------------------------- */
             var typingsDone = plugins.q.defer();
-            var checkTypingsDone = function(indexArg:number,compareArray){
-                if((indexArg + 1) == compareArray.length){
+            var typingsCounter:number = 0;
+            var typingsCounterAdvance = function(){
+                typingsCounter++;
+                if(typeof config.typings[typingsCounter] != "undefined"){
+                    installTypings();
+                } else {
                     plugins.beautylog.success("custom typings installed successfully");
                     typingsDone.resolve();
                 }
             };
-            for (var key in config.typings) {
-                plugins.beautylog.log("now installing " + "typings.json".yellow + " from " + config.typings[key].blue);
-                plugins.typings.install({production: false, cwd: plugins.path.join(paths.cwd,config.typings[key])})
+            var installTypings = function() {
+                plugins.beautylog.log("now installing " + "typings.json".yellow + " from " + config.typings[typingsCounter].blue);
+                plugins.typings.install({production: false, cwd: plugins.path.join(paths.cwd,config.typings[typingsCounter])})
                     .then(function(){
-                        checkTypingsDone(key,config.typings);
+                        typingsCounterAdvance();
+                    },function(){
+                        plugins.beautylog.error("something went wrong: Check if path is correct: " + config.typings[typingsCounter].blue);
+                        typingsCounterAdvance();
                     });
-            }
+            };
+            installTypings();
             /* -------------------------------------------------
              * ----------- second compile TS -------------------
              * ----------------------------------------------- */
diff --git a/ts/npmts.plugins.ts b/ts/npmts.plugins.ts
index 039e92b..5e5f7b2 100644
--- a/ts/npmts.plugins.ts
+++ b/ts/npmts.plugins.ts
@@ -11,6 +11,7 @@ module NpmtsPlugins {
                 typescript: require("gulp-typescript")
 
             },
+            mathjs: require("mathjs"),
             mergeStream: require("merge2"),
             mocha: require("mocha"),
             path: require("path"),