diff --git a/randomwallpaper@iflow.space/history.js b/randomwallpaper@iflow.space/history.js
index 405fcdb..ab7a151 100644
--- a/randomwallpaper@iflow.space/history.js
+++ b/randomwallpaper@iflow.space/history.js
@@ -109,7 +109,7 @@ let HistoryController = new Lang.Class({
 	 * Clear the history and delete all photos except the current one.
 	 * @returns {boolean}
 	 */
-	clear() {
+	clear: function() {
 		let firstHistoryElement = this.history[0];
 
 		if (firstHistoryElement)
diff --git a/randomwallpaper@iflow.space/logger.js b/randomwallpaper@iflow.space/logger.js
index d0a4fc0..9481ac9 100644
--- a/randomwallpaper@iflow.space/logger.js
+++ b/randomwallpaper@iflow.space/logger.js
@@ -11,7 +11,7 @@ let Logger = new Lang.Class({
 	},
 
 	_log: function(level, message) {
-		global.log(`${this._prefix} [${level}] >> ${this._callingClass} :: ${message}`);
+		global.log(this._prefix + " [" + level + "] >> " + this._callingClass + " :: " + message);
 	},
 
 	debug: function (message) {