diff --git a/tsconfig.json b/tsconfig.json
index 2d6fbdf..c44b729 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -10,7 +10,7 @@
     "moduleResolution": "node",
     "importHelpers": true,
     "isolatedModules": true,
-	"strictNullChecks": true,
+    "strictNullChecks": true,
     "lib": [
       "DOM",
       "ES5",