diff --git a/plugins/org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/WizardConfig.xtend b/plugins/org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/WizardConfig.xtend
index 7d2df7eb8..5503be42e 100644
--- a/plugins/org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/WizardConfig.xtend
+++ b/plugins/org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/WizardConfig.xtend
@@ -44,11 +44,15 @@ class WizardConfig extends XtextProjectConfig {
 	
 	override checkConfiguration(Issues issues) {
 		super.checkConfiguration(issues)
-		val runtimeBase = runtimeRoot?.path
-		if (runtimeBase.nullOrEmpty) {
-			issues.addError('The property \'runtimeRoot\' must be set.', this)
+		if (rootPath == null) {
+			issues.addError('The property \'rootPath\' must be set.', this)
 			return
 		}
+		if (baseName == null) {
+			issues.addError('The property \'baseName\' must be set.', this)
+			return
+		}
+		val runtimeBase = runtimeRoot?.path
 		if (!Character.isJavaIdentifierPart(runtimeBase.charAt(runtimeBase.length - 1)))
 			issues.addError('The runtime root path must end with a valid package name.', this)
 		if ((ideaEditor || webSupport) && !genericIdeSupport)