diff --git a/jsonparse.js b/jsonparse.js
index 3991060..278a800 100644
--- a/jsonparse.js
+++ b/jsonparse.js
@@ -267,7 +267,7 @@ proto.write = function (buffer) {
               return this.charError(buffer, i);
             }
 
-            if ((this.string.match(/[0-9]+/) == this.string) && (result.toString() != this.string)) {
+            if (/^-?[0-9]+$/.test(this.string) && (result.toString() != this.string)) {
               // Long string of digits which is an ID string and not valid and/or safe JavaScript integer Number
               this.onToken(STRING, this.string);
             } else {
diff --git a/test/primitives.js b/test/primitives.js
index 33cae16..ee8a015 100644
--- a/test/primitives.js
+++ b/test/primitives.js
@@ -26,11 +26,13 @@ var expected = [
   [ [ 0 ], 6.02e+23 ],
   [ [], [ 6.02e+23 ] ],
   [ [ 0 ], '7161093205057351174' ],
-  [ [], [ '7161093205057351174'] ]
+  [ [], [ '7161093205057351174'] ],
+  [ [ 0 ], '-9223372036854775808' ],
+  [ [], [ '-9223372036854775808'] ],
 ];
 
 test('primitives', function (t) {
-  t.plan(25);
+  t.plan(27);
 
   var p = new Parser();
   p.onValue = function (value) {
@@ -54,4 +56,5 @@ test('primitives', function (t) {
   p.write('[1.0,1.1,-1.1,-1.0][-1][-0.1]');
   p.write('[6.02e23]');
   p.write('[7161093205057351174]');
+  p.write('[-9223372036854775808]');
 });