diff --git a/test/spec/ol/expr/expression.test.js b/test/spec/ol/expr/expression.test.js
index 9cbf40b516..2816365667 100644
--- a/test/spec/ol/expr/expression.test.js
+++ b/test/spec/ol/expr/expression.test.js
@@ -680,12 +680,12 @@ describe('ol.expr.lib', function() {
     var start = evaluate(counter);
 
     it('increases the counter with every call', function() {
-      expect(evaluate(counter).to.be(start + 1));
-      expect(evaluate(counter).to.be(start + 2));
+      expect(evaluate(counter)).to.be(start + 1);
+      expect(evaluate(counter)).to.be(start + 2);
     });
 
     it('increases the counter, starting with a custom value', function() {
-      expect(evaluate(counterWithStart).to.be(start + 3 + 1000));
+      expect(evaluate(counterWithStart)).to.be(start + 3 + 1000);
     });
 
   });