diff --git a/src/ol/structs/integerset.js b/src/ol/structs/integerset.js
index 17967c57bc..17fc2ebc53 100644
--- a/src/ol/structs/integerset.js
+++ b/src/ol/structs/integerset.js
@@ -80,7 +80,6 @@ ol.structs.IntegerSet.prototype.compactRanges_ = function() {
   var arr = this.arr_;
   var n = arr.length;
   var rangeIndex = 0;
-  var lastRange = null;
   var i;
   for (i = 0; i < n; i += 2) {
     if (arr[i] == arr[i + 1]) {
diff --git a/test/spec/ol/structs/integerset.test.js b/test/spec/ol/structs/integerset.test.js
index 8cd1728b64..2fb7af18fa 100644
--- a/test/spec/ol/structs/integerset.test.js
+++ b/test/spec/ol/structs/integerset.test.js
@@ -26,12 +26,14 @@ describe('ol.structs.IntegerSet', function() {
       it('throws an exception with an odd number of elements', function() {
         expect(function() {
           var is = new ol.structs.IntegerSet([0, 2, 4]);
+          is = is; // suppress gjslint warning about unused variable
         }).to.throwException();
       });
 
       it('throws an exception with out-of-order elements', function() {
         expect(function() {
           var is = new ol.structs.IntegerSet([0, 2, 2, 4]);
+          is = is; // suppress gjslint warning about unused variable
         }).to.throwException();
       });
 
diff --git a/test/spec/ol/structs/priorityqueue.test.js b/test/spec/ol/structs/priorityqueue.test.js
index b80350294f..60e84e455b 100644
--- a/test/spec/ol/structs/priorityqueue.test.js
+++ b/test/spec/ol/structs/priorityqueue.test.js
@@ -82,7 +82,7 @@ describe('ol.structs.PriorityQueue', function() {
       pq = new ol.structs.PriorityQueue(function(element) {
         return Math.abs(element - target);
       }, goog.identityFunction);
-      var element, i;
+      var i;
       for (i = 0; i < 32; ++i) {
         pq.enqueue(Math.random());
       }