diff --git a/ webgoat/main/project/JavaSource/org/owasp/webgoat/lessons/ThreadSafetyProblem.java b/ webgoat/main/project/JavaSource/org/owasp/webgoat/lessons/ThreadSafetyProblem.java
index efb70a310..8411e58be 100644
--- a/ webgoat/main/project/JavaSource/org/owasp/webgoat/lessons/ThreadSafetyProblem.java	
+++ b/ webgoat/main/project/JavaSource/org/owasp/webgoat/lessons/ThreadSafetyProblem.java	
@@ -180,7 +180,7 @@ public class ThreadSafetyProblem extends LessonAdapter
 
     protected Category getDefaultCategory()
     {
-	return Category.GENERAL;
+	return Category.CONCURRENCY;
     }