diff --git a/src/test/system-test.js b/src/test/system-test.js
index 028f017d4..289167751 100644
--- a/src/test/system-test.js
+++ b/src/test/system-test.js
@@ -47,8 +47,10 @@ describe('System', function () {
     it('can get memory', function (done) {
         system.getMemory(function (error, memory) {
             expect(!error).to.be.ok();
-            expect(memory.memory).to.be.ok();
-            expect(memory.swap).to.be.ok();
+
+            expect(memory.memory).to.be.a('number');
+            expect(memory.swap).to.be.a('number');
+
             done();
         });
     });