diff --git a/src/post-worker.js b/src/post-worker.js
index 6f81d32d..9004690b 100644
--- a/src/post-worker.js
+++ b/src/post-worker.js
@@ -266,7 +266,7 @@ self.oneshotRender = function (lastRenderedTime, renderNow, iteration) {
     var eventFinish = -1.0, emptyFinish = -1.0, animated = false;
     var rendered = {};
     if (eventStart >= 0) {
-        eventTimes = self.octObj.findEventStopTimes(eventStart);
+        var eventTimes = self.octObj.findEventStopTimes(eventStart);
         eventFinish = eventTimes.eventFinish;
         emptyFinish = eventTimes.emptyFinish;
         animated = eventTimes.is_animated;
diff --git a/src/subtitles-octopus.js b/src/subtitles-octopus.js
index 5ef1db3c..32583d83 100644
--- a/src/subtitles-octopus.js
+++ b/src/subtitles-octopus.js
@@ -10,7 +10,7 @@ var SubtitlesOctopus = function (options) {
     try {
         if (typeof WebAssembly === "object"
             && typeof WebAssembly.instantiate === "function") {
-            const module = new WebAssembly.Module(Uint8Array.of(0x0, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00));
+            var module = new WebAssembly.Module(Uint8Array.of(0x0, 0x61, 0x73, 0x6d, 0x01, 0x00, 0x00, 0x00));
             if (module instanceof WebAssembly.Module)
                 supportsWebAssembly = (new WebAssembly.Instance(module) instanceof WebAssembly.Instance);
         }