diff --git a/src/main/java/de/dhbwstuttgart/syntaxtree/type/RefTypeOrTPHOrWildcardOrGeneric.java b/src/main/java/de/dhbwstuttgart/syntaxtree/type/RefTypeOrTPHOrWildcardOrGeneric.java
index d20d451d..61cfd060 100644
--- a/src/main/java/de/dhbwstuttgart/syntaxtree/type/RefTypeOrTPHOrWildcardOrGeneric.java
+++ b/src/main/java/de/dhbwstuttgart/syntaxtree/type/RefTypeOrTPHOrWildcardOrGeneric.java
@@ -16,4 +16,6 @@ public abstract class RefTypeOrTPHOrWildcardOrGeneric extends SyntaxTreeNode{
     public abstract <A> A acceptTV(TypeVisitor<A> visitor);
     public abstract void accept(ResultSetVisitor visitor);
     
+    public abstract boolean equals(Object o);
+    
 }