diff --git a/test/spec.js b/test/spec.js
index a20f309..b5ddeaa 100644
--- a/test/spec.js
+++ b/test/spec.js
@@ -11,7 +11,7 @@ describe('ago', function() {
 
 	it('should return "just now" if under 1 minute', function() {
 		expect(ago(timestamp)).to.equal('just now');
-		expect(ago(new Date(timestamp + 10000))).to.equal('just now');
+		expect(ago(new Date(+timestamp + 10000))).to.equal('just now');
 	});
 
 	it('minute', function() {
@@ -112,4 +112,4 @@ describe('ago', function() {
 		expect(ago(years4)).to.equal('100000 years ago');
 	});
 
-});
\ No newline at end of file
+});