diff --git a/src/de/dhbwstuttgart/syntaxtree/ClassOrInterface.java b/src/de/dhbwstuttgart/syntaxtree/ClassOrInterface.java
index 72097fc0..00788b63 100644
--- a/src/de/dhbwstuttgart/syntaxtree/ClassOrInterface.java
+++ b/src/de/dhbwstuttgart/syntaxtree/ClassOrInterface.java
@@ -1,5 +1,6 @@
 package de.dhbwstuttgart.syntaxtree;
 
+import com.sun.org.apache.xpath.internal.operations.Mod;
 import de.dhbwstuttgart.core.IItemWithOffset;
 import de.dhbwstuttgart.exceptions.DebugException;
 import de.dhbwstuttgart.parser.scope.JavaClassName;
@@ -12,6 +13,7 @@ import de.dhbwstuttgart.typeinference.constraints.ConstraintSet;
 import de.dhbwstuttgart.typeinference.assumptions.TypeInferenceInformation;
 import org.antlr.v4.runtime.Token;
 
+import java.lang.reflect.Modifier;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;
@@ -33,6 +35,7 @@ public class ClassOrInterface extends SyntaxTreeNode implements TypeScope{
   public ClassOrInterface(int modifiers, JavaClassName name, List<Field> fielddecl, List<Method> methods, List<Constructor> constructors, GenericDeclarationList genericClassParameters,
                           RefType superClass, Boolean isInterface, List<RefType> implementedInterfaces, Token offset){
     super(offset);
+    if(isInterface && !Modifier.isInterface(modifiers))modifiers += Modifier.INTERFACE;
       this.modifiers = modifiers;
       this.name = name;
       this.fields = fielddecl;