diff --git a/test/spec/ol/source/rastersource.test.js b/test/spec/ol/source/rastersource.test.js
index 8d779c45d9..12b1d08c4f 100644
--- a/test/spec/ol/source/rastersource.test.js
+++ b/test/spec/ol/source/rastersource.test.js
@@ -112,7 +112,7 @@ maybeDescribe('ol.source.Raster', function() {
         }
       });
 
-      source.on('afteroperations', function() {
+      source.once('afteroperations', function() {
         expect(log.length).to.equal(4);
         var inputs = log[0];
         var pixel = inputs[0];