diff --git a/lib/logger.js b/lib/logger.js
index ba518f0e..ed7da569 100644
--- a/lib/logger.js
+++ b/lib/logger.js
@@ -1,6 +1,6 @@
 const npmlog = require("npmlog");
 
-const levels = ["silly", "verbose", "info", "warn", "error"];
+const levels = ["silly", "verbose", "info", "warn", "error", "silent"];
 if (process.env.UI5_LOG_LVL) {
 	const logLvl = process.env.UI5_LOG_LVL;
 	if (!levels.includes(logLvl)) {
@@ -18,6 +18,22 @@ npmlog.on("error", (err) => {
 	console.log(err);
 });
 
+function isLevelEnabled(levelName) {
+	const currIdx = levels.indexOf(npmlog.level);
+	const reqIdx = levels.indexOf(levelName);
+	if (currIdx === -1) {
+		throw new Error(`Failed to find current log level "${npmlog.level}"" in list of expected log levels`);
+	}
+	if (reqIdx === -1) {
+		throw new Error(`Unkown log level "${levelName}"`);
+	}
+	if (reqIdx >= currIdx) {
+		return true;
+	} else {
+		return false;
+	}
+}
+
 class Logger {
 	constructor(moduleName) {
 		this._moduleName = moduleName;
@@ -25,19 +41,7 @@ class Logger {
 	}
 
 	isLevelEnabled(levelName) {
-		const currIdx = levels.indexOf(npmlog.level);
-		const reqIdx = levels.indexOf(levelName);
-		if (currIdx === -1) {
-			throw new Error(`Failed to find current log level ${npmlog.level} in list of expected log levels`);
-		}
-		if (reqIdx === -1) {
-			throw new Error(`Unkown log level "${levelName}"`);
-		}
-		if (reqIdx >= currIdx) {
-			return true;
-		} else {
-			return false;
-		}
+		return isLevelEnabled(levelName);
 	}
 
 	silly(...messages) {
@@ -129,9 +133,14 @@ module.exports = {
 	},
 
 	setLevel(level) {
+		if (!levels.includes(level)) {
+			throw new Error(`Unkown log level "${level}"`);
+		}
 		return npmlog.level = level;
 	},
 
+	isLevelEnabled,
+
 	setShowProgress(showProgress) {
 		if (showProgress) {
 			npmlog.enableProgress();