diff --git a/core-lib/es5/src/main/java/def/js/Globals.java b/core-lib/es5/src/main/java/def/js/Globals.java
index 75ec8ecf..6fefa590 100644
--- a/core-lib/es5/src/main/java/def/js/Globals.java
+++ b/core-lib/es5/src/main/java/def/js/Globals.java
@@ -21,7 +21,7 @@ public final class Globals extends def.js.Object {
 	/**
 	 * The JavaScript <code>undefined</code> global property.
 	 */
-	public static final Object undefined = null;
+	public static java.lang.Object undefined;
 	
 	/**
 	 * Accesses the current method arguments (<code>arguments</code> implicit
diff --git a/core-lib/es6/src/main/java/def/js/Globals.java b/core-lib/es6/src/main/java/def/js/Globals.java
index f7800ff5..57aea98e 100644
--- a/core-lib/es6/src/main/java/def/js/Globals.java
+++ b/core-lib/es6/src/main/java/def/js/Globals.java
@@ -21,7 +21,7 @@ public final class Globals {
 	/**
 	 * The JavaScript <code>undefined</code> global property.
 	 */
-	public static final Object undefined = null;
+	public static final java.lang.Object undefined = null;
 	
 	/**
 	 * Accesses the current method arguments (<code>arguments</code> implicit