diff --git a/src/de/dhbwstuttgart/parser/SyntaxTreeGenerator/SyntaxTreeGenerator.java b/src/de/dhbwstuttgart/parser/SyntaxTreeGenerator/SyntaxTreeGenerator.java
index b5ade811..c5b135e6 100644
--- a/src/de/dhbwstuttgart/parser/SyntaxTreeGenerator/SyntaxTreeGenerator.java
+++ b/src/de/dhbwstuttgart/parser/SyntaxTreeGenerator/SyntaxTreeGenerator.java
@@ -379,6 +379,8 @@ public class SyntaxTreeGenerator{
         modifiers += newModifier;
       }
     }
+    if(!Modifier.isInterface(modifiers))modifiers += Modifier.INTERFACE;
+    
     JavaClassName name = reg.getName(ctx.Identifier().getText());
 
     GenericsRegistry generics = createGenerics(ctx.typeParameters(), name, "", reg, new GenericsRegistry(globalGenerics));