diff --git a/.gitignore b/.gitignore
index 507ccc3..e572bd6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 build/
 hoge.db
 node_modules/
+version.h
diff --git a/Makefile b/Makefile
index b792678..18e4b9f 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,10 @@ all: gdbm.node
 build/config.log:
 	node-waf configure
 
-gdbm.node: gdbm.cc build/config.log
+version.h:
+	node author/version.js
+
+gdbm.node: gdbm.cc build/config.log version.h
 	node-waf
 
 test: gdbm.node
@@ -13,7 +16,7 @@ deps:
 	npm install
 
 clean:
-	rm -rf build/ hoge.db .lock-wscript
+	rm -rf build/ hoge.db .lock-wscript version.h
 
 push: test clean
 	npm publish
diff --git a/author/version.js b/author/version.js
new file mode 100644
index 0000000..24d60f8
--- /dev/null
+++ b/author/version.js
@@ -0,0 +1,7 @@
+var fs = require('fs'),
+    undefined;
+
+var src = fs.readFileSync('package.json', 'utf-8');
+var dat = JSON.parse(src);
+fs.writeFileSync('version.h', '#define NODE_GDBM_VERSION "' + dat.version + "\"\n");
+
diff --git a/gdbm.cc b/gdbm.cc
index 83cf72c..072429b 100644
--- a/gdbm.cc
+++ b/gdbm.cc
@@ -6,13 +6,13 @@
 #include <stdlib.h>
 #include <cstdio>
 
+#include "version.h"
+
 using namespace v8;
 using namespace node;
 
 #define THROW(msg) return ThrowException(Exception::Error(String::New(msg)));
 
-#define NODE_GDBM_VERSION "1.0.2"
-
 static Persistent<String> open_symbol;
 static Persistent<String> close_symbol;
 static Persistent<String> store_symbol;
diff --git a/package.json b/package.json
index a641572..30de258 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "author": "Tokuhiro Matsuno <tokuhirom@gmail.com> (http://64p.org/)",
   "name": "gdbm",
   "description": "gdbm for node.js",
-  "version": "1.0.2",
+  "version": "1.0.3",
   "url": "https://github.com/tokuhirom/node-gdbm/",
   "repository": {
     "type": "git",