diff --git a/siema/index.d.ts b/siema/index.d.ts
index 7f9fed8cf5..52b6205dad 100644
--- a/siema/index.d.ts
+++ b/siema/index.d.ts
@@ -1,28 +1,26 @@
-// Type definitions for siema
+// Type definitions for siema 1.0
 // Project: https://github.com/pawelgrzybek/siema
 // Definitions by: Irmantas Zenkus <https://github.com/Irmiz>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-declare module 'siema' {
-    interface SiemaOptions {
-        selector?: string;
-        duration?: number;
-        easing?: string;
-        perPage?: number;
-        startIndex?: number;
-        draggable?: boolean;
-        threshold?: number;
-        loop?: boolean;
-    }
+declare class Siema {
+    currentSlide: number;
 
-    class Siema {
-        public currentSlide: number;
+    constructor(options?: SiemaOptions);
 
-        constructor(options?: SiemaOptions);
-
-        public next(): void;
-        public prev(): void;
-        public goTo(index: number): void;
-    }
-
-    export = Siema;
+    next(): void;
+    prev(): void;
+    goTo(index: number): void;
 }
+
+interface SiemaOptions {
+    selector?: string;
+    duration?: number;
+    easing?: string;
+    perPage?: number;
+    startIndex?: number;
+    draggable?: boolean;
+    threshold?: number;
+    loop?: boolean;
+}
+
+export = Siema;
diff --git a/siema/siema-tests.ts b/siema/siema-tests.ts
index b576e8dac6..3851b2b705 100644
--- a/siema/siema-tests.ts
+++ b/siema/siema-tests.ts
@@ -13,5 +13,4 @@ const siema = new Siema({
 
 siema.next();
 siema.prev();
-siema.goTo(0);
-siema.currentSlide;
+siema.goTo(siema.currentSlide);
diff --git a/siema/tsconfig.json b/siema/tsconfig.json
index b7b76fb08a..b65c3dc04f 100644
--- a/siema/tsconfig.json
+++ b/siema/tsconfig.json
@@ -4,7 +4,7 @@
         "target": "es6",
         "noImplicitAny": true,
         "noImplicitThis": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "baseUrl": "../",
         "typeRoots": [
             "../"
diff --git a/siema/tslint.json b/siema/tslint.json
new file mode 100644
index 0000000000..f9e30021f4
--- /dev/null
+++ b/siema/tslint.json
@@ -0,0 +1,3 @@
+{
+    "extends": "../tslint.json"
+}