diff --git a/test.js b/test.js
index 7ff2c24..d6ffce8 100644
--- a/test.js
+++ b/test.js
@@ -15,7 +15,7 @@ describe("Key convertion", function() {
   });
 
   it("should throw on invalid private key", function() {
-    expect(eccrypto.getPublic.bind(null, Buffer("test"))).to.throw(Error);
+    expect(eccrypto.getPublic.bind(null, Buffer("00", "hex"))).to.throw(Error);
   });
 });