diff --git a/index.js b/index.js
index fef179b..ba363ee 100644
--- a/index.js
+++ b/index.js
@@ -62,7 +62,7 @@ exports.parse = function parseIntelHex(data, bufferSize) {
 			lowAddress + recordType) & 0xFF;
 		for(var i = 0; i < dataLength; i++)
 			calcChecksum = (calcChecksum + dataFieldBuf[i]) & 0xFF;
-		calcChecksum = 0x100 - calcChecksum;
+		calcChecksum = (0x100 - calcChecksum) & 0xFF;
 		if(checksum != calcChecksum)
 			throw new Error("Invalid checksum on line " + lineNum +
 				": got " + checksum + ", but expected " + calcChecksum);
diff --git a/package.json b/package.json
index f4dbb07..271be5c 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "intel-hex",
-	"version": "0.1.0",
+	"version": "0.1.1",
 	"description": "A JavaScript parser/writer for Intel HEX file format.",
 	"main": "index.js",
 	"scripts": {