diff --git a/package.json b/package.json
index e251a44..6b30232 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "fixed-width-ts-decorator",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "description": "Fixed width file handler with TypeScript Decorator",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",
diff --git a/tsconfig.json b/tsconfig.json
index e326611..7ef1027 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -7,6 +7,7 @@
     "experimentalDecorators": true,
     "esModuleInterop": true,
     "sourceMap": true,
+    "declarationMap": true,
     "strict": true,
     "strictPropertyInitialization": false,
     "lib": [